X708

X708 V2.0 UPS HAT

X708 V1.2 UPS HAT(Sold Out)

X708 V1.0 UPS HAT(Sold Out)

X708 V2.0/V1.2/V1.0 UPS HAT

X708 V2.0/V1.2/V1.0 UPS HAT

X708 V2.0/V1.2/V1.0 Battery

X708+X728-A2

Foreword

Note:

The x708 has been sold out and there is no plan to produce it for the time being. You can use the X728, which can completely replace the X708

If you want to purchase in bulk, please contact us at info@geekworm.com

NOTE: The X708 UPS DOES NOT support Raspberry Pi 5 hardware

Why did X708 come out？

Although we provide a compelete raspberry pi NAS solution with NAS shield(X825/X857/X829/X835 etc.),X735 and matching metal case, but we still have received many feedbacks that want to support UPS, so we have to respond to this request.

Our original intention of designing X708 is to match with NAS shell (such as X829-C1, X857-C3 or X857-C1, X825-C7) to provide a raspberry pi NAS solution with UPS function. In order to save space, we must separate the battery from the UPS expansion board when designing . This is also the biggest difference between X708 and X728;

Safety Instructions and Warnings

You must read these safety instructions and warnings before charging your batteries.

• Lithium Polymer and Li-ion batteries are volatile. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly.
• Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-".
• Do not mix and use old batteries and new batteries, or batteries with different brand names.
• Lithium batteries has it's cycle life, please replace old battery with new one when it reaches it's service life or when it is two year old, whichever comes first.
• When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X708 on the wood material or carpet and unattended.
• Must keep the X708 away from children.
• Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/

Update History

X708 V2.0 is released

x708 v2.0 is release on April 2022.

Update:

• Added protection circuit and alarm function when the battery is reversely connected (RESERVED will be on)
• Supports the control of two fan speeds
• Solved the problem that the old version can't charge when the battery is exhausted
• Improved AUTO ON function
• Added battery over-discharge function
• Improved power path management function: when external AC power is supplied, the AC PSU supplies power to the UPS shield and also charges the battery.

X708 V1.2(off-production)

Update:

• Remove the ASD function but you can achieve this function through software programming. Please refer to X708-Software
• New added GPIO16 to control fan speed, HIGH=>fast fan speed, LOW=>slow fan speed; refer to X708-Hardware
• Added voltage surge protection circuit

Overview

The X708 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header. It provides 5.1V Max. 8000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown，AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, and a cooling fan.

The X708 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X708 can also be used with the X825/X828/X829 (2.5" HDD/SSD Shield) and X857/X862/X872(MSATA/M.2 SSD shield) for safe data backup.

There is a 8-cell 18650 battery holder X708-A1 for X708, please refer to X708-A1.

Some key features:

1. Excellent UPS function such as Power Loss Detection(PLD), Automatic Safe Shutdown(ASD), Auto Power On(AON) etc., DC 5V Max. 6A output;
2. With cooling fan, no extra cooling solution.
3. HAT size. Separate the battery from the expansion board, which can save a lot of space, which will bring more flexibility.
4. Reserved two kind battery port (XH2.54 and PH2.0), supports 3.7V 18650 lithium battery and 3.7V lithium polymer battery, No capacity limit, only request 3.7V lithium battery (No include lithium battery)

Working principle

The GPIO13 is used to control the power button, It goes high for 3 seconds that means the power switch is pressed and held for 3 seconds. then the X708 will issue a pulse to inform the system to implement safeshutdown via GPIO5, and will monitor the GPIO12, once shutdown process is implemented, GPIO 12 will go to low and will be recognized by the X708, then the X708 will wait for 7-8seconds then fully cut off power.

Firstly you have to get the script for power management well installed and run at boot. You can use the onboard power switch to verify , press and hold for 3 seconds, the blue LED will flash slowly and the shutdown is going then all LEDs will be off. once this works, then you can use the GPIO13 control.

The hardware and its firmware are verified. if you have a DMM, you can use it mesuare the GPIO voltage which will be helpful to understand above.

Features

FOR USE WITH	Raspberry Pi 1 Model B+/ 2 Model B / 3 Model B / 3 Model B+ / 3 Model A+ / 4 Model B
Operating System	Raspbian Stretch Safe shutdown function tested for Raspbian, other operating systems to be tested and advised
KEY FEATURES	Smart and powerful Uninterruptible Power Supply (UPS) Provides continuous operations for up to 10~30hours (depending on battery type and qty used) Max 5.1V 6000mA Power Backup for even the most demanding RPi set ups Supports 2A/3A fast battery charging Integrated over current protection and over voltage protection Integrated Maxim's fuel-gauge systems (Reading battery voltage and percentage via i2c) Integrated 10-A fully-integrated synchronous boost converter Intelligent automatic charging and discharging Operate in both charge mode and boost mode to allow full system management and battery power mgt Integrated IN-to-SYS pass-through path to pass the input voltage to the system Advanced system power-path management avoids batteries frequent charging and discharging Advanced system power-path management allows 3A fast charging and powering Raspberry Pi at the same time On-board 4 green LEDs indicate battery charging and discharging levels of 25%, 50% , 75% and 100% Batteries attach via PH2.0-2P or XH2.54-2P Intelligent and safe power management Equipped with momentary button for easy power control Press the button to turn on Press the button and hold for 1~2seconds to reboot Press the button and hold for 3~7seconds to implement safe shutdown Press the button and hold for >8seconds to force shutdown Supports safe shutdown and full poweroff from software On-board blue LED shows the status of power on, reboot and shutdown AC power loss or power adapter failure detection (LED and GPIO indication) Optional to enable Auto power on when power applied or restored Automatic safe shutdown when battery low (voltage <3.0V) Ultra-low standby power consumption to maximize battery life Integrated cooling fan that allows the heat from your Raspberry Pi to dissipate! Completely solve the overheating problem of your Raspberry Pi Efficient drop temp of Raspberry Pi CPU Misc Powers the Raspberry Pi via the 40-pin header - no additional cabling required Standard Raspberry Pi extension interface, compatible with other expansion boards DC power jack (5.5*2.5mm) and Type-C socket convenient for power input On-board PH2.0 connector allows to connect external power switch and DIY your perfect case On-board XH2.54 power output connector allows to power other devices
SPECIFICATION	Power supply via Type-C socket: 5Vdc ±5%, ≥3A; Via DC power jack: 5Vdc ±5%, ≥4A UPS output : 5.1V ±5% Max. 6A UPS charging current: 1.8~2.2A / 2.3~3.2A Terminal Battery Voltage : 4.24V Recharge Threshold : 4.1V Battery: 3.7 Lithium Battery
NOTES	Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket. Do not use the battery with built-in protection circuit.

How to Power

• Power via DC5521 Jack of X708, 5.1Vdc +/-5% , ≥4A (DC5525 Jack is compatible with DC5521, also support 5V PSU with DC5525 Jack)
• Power via USB Type-C port of X708, 5.1Vdc +/-5% , ≥3A (Geekworm Type-C 5V 4A 20W power supply is recommended.）

X728-C1

X728-C1 is a metal case for X708 / X735 or X728 V2.2 / V2.1 / V2.0.

Installation Video: https://youtu.be/QOG30LXb6ds

• 

  for X735/X708/X728 V2.x/

• 

  with metal switch

• 

  active cool

• 

  application

• 

  dimension

• 

  x728-c1 Accessories

• 

  with GPIO hole

Packing List

• 1 x X708 Expansion Board
• 8 x M2.5 *5mm Screws
• 4 x M2.5 *12+6mm Spacers
• 4 x M2.5 *12mm Spacers
• 2 x Jumper link Pitch 2.54mm

User Manual

Installation Video

Installation Video for Raspberry Pi 4+X825 V1.5+X708/U100/X735+X825-C7 Case: https://youtu.be/kKIPf4AsiYY

Installation video for Raspberry Pi 4+X857 V1.2/X862 V1.0/X872 V1.1+X708/U100+X857-C1 Case: https://youtu.be/HGPpfDbfyxM

Software & Hardware Guide

• X708-script: This script is required to install to enable safe shutdown function.
• X708-Hardware: Provides some hardware parameter information
• AutoCAD Drawing Interchange Format file: File:X708-PCB-V1.0.zip

FAQ

Q1: What battery is recommended for X708?

A:

• Pls use high quality batteries from PANPASONIC, Toshiba, etc.
• Lithium battery need to meet following 2 conditions: 1. Working voltage: 3.6V-3.7V; 2. Maximum voltage after full: 4.2V
• Do not use the battery with built-in protection circuit

Q2: What type connector to request for lithium battery?

• A: X708 provides two type battery connectors: PH2.0-2P and XH2.54-2P, you can connect two battery at the same time, BUT please use the same model batteries, also please pay attention that the polarity of the XH2.54 and PH2.0 connectors is different.

Q3: Is there a corresponding UPS NAS solution for 3.5-inch hard drives?

• A: Sorry, There is no UPS NAS solution for 3.5-inch hard drive because the 3.5-inch hdd request 12V voltage, so we have no plans to support this demand for the time being. BUT you can refer to X835//X832, and they can solve some of your needs, they need external power supply.

Q4: How to restart the pi board when AC Power supply is connected?

• A: Please enable 'AUTO POWER ON' or 'AUTO ON' function if you want restart when the AC Power supply is reapplied.

Q6: About auto shutdown, found your board will auto shutdown.

• A: Please check if enable the ASD function (shorted the ASD header), if you enable the ASD function, please sure your oeration is right: first, place the battery into the battery holder, insert the jumper to ASD header after 3 second,this is very important!!

Q7: Does the X708 support to use without any battery installed?

• A: Yes, it is ok to use the X708 without battery, but please note that do not use low quality power supply.

Q8: Why the X708 does not work normally?

• A: Please make sure you have install the script before use, please refer to X708-Software

Q9:If "AON" is shorted, can you use a latching power switch to turn the x708 on/off, or is it on all the time, regardless of the switch?

• A:Sorry, this is not supported.

Q10:Does the X708 support to use the latching switch?

• A:No, the X708 does not support to connect latching switch, only support momentary switch.

Q11: What is the fan type of the X708?

• A: It is szie 3010 cooling fan with PH2.0-2P connector.

Q12: Can you use the X708 with a poe hat to provide the power?

• A: No, not suggest to use like this.

Q13: Why does the X708 power off automatically?

• A: Please use 3.7V lithium polymer battery without protection board, or battery with enough discharge capacity, or the X708 will power off automatically when use with high load. Refer to video test: https://youtu.be/Saco6rJm4ZQ

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Anonymous user #31

one month ago

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Hello everybody

I use a UPS X708 from two year ago to control a Raspberry and OpenCPN. From the last navigation, the UPS has a rare working. Normally when the power supply disappear, the OpenCPN close by a deamon then 5sec later the Ups shutdown the raspberry ans stop all. But from a week, when the PS dissappear, the OpenCPN stop, the Raspberry shutdonx, but Bleu LED flash three time for +/- 10 sec, then the raspi reboot with the PS always off ? I have try different way, manually shutdown raspi then the UPS, but problem still. If when UPS and Raspi ON, I press the pushbutton for 3 sec, raspberry shutdown immediately. Any body a idea why ??

Thank you

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Anonymous user #30

4 months ago

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Hi, the auto on after power failure is not working consistently. To power on sometimes I need to unplug the USB C power cable and re-plug.

Please note that I have consistently: 1) Waited a few minutes after the battery indicator light is off - a long as 5 minutes, there is no way the USB plug is still providing power. 2) USB plug is disconnected from mains.

Thanks in advance

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Lisa

4 months ago

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Hi,Could you please tell us your order number by email [info@geekworm.com]? Thanks.

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Anonymous user #29

10 months ago

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Hello, I would like to ask a question, please:

On the x728 model, if the power supply is turned off and the battery voltage drops below 3.0, the Raspberry will shut down.

However, if the power supply returns and the battery voltage is higher than 2.6, the Raspberry does not auto power on.

Does this behavior also occur with the x708 model?

Thanks in advance!

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Walker

10 months ago

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Hi, when using the X708, please use a 3.7V lithium polymer battery, or a battery with sufficient discharge capacity, otherwise the X708 will automatically cut off when used at high loads.

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Anonymous user #28

12 months ago

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can I use this on the new RPI5?

Volts and Amps wise, it seems to be able to support it. can anyone confirm this?

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Walker

12 months ago

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Hello, whether the X708 can be used on the Raspberry Pi 5, we have not tested it, and we are currently accelerating the design of Raspberry Pi 5 related products, which are expected to be on the shelves of our store soon, please pay attention to our product updates

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Anonymous user #10

15 months ago

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4p power switch connected to x708 board and in use. It keeps trying to reboot repeatedly even when the power is weak when the power is turned on.

Is there a way to stop trying to reboot when the battery is low power?

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Harry

15 months ago

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Please provice more details via email to support@geekworm.com

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Anonymous user #26

15 months ago

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Hi, in the python battery code : def readVoltage(self): address = 0x36 read = self._bus.read_word_data(address, 2) swapped = struct.unpack("<H", struct.pack(">H", read))[0] self.voltage = swapped * 1.25 / 1000 / 16 return self.voltage

def readCapacity(self): address = 0x36 read = self._bus.read_word_data(address, 4) swapped = struct.unpack("<H", struct.pack(">H", read))[0] self.capacity = swapped / 256 if self.capacity > 100: self.capacity = 100 return self.capacity

what value i need to chnage to fit my battery spec ? Thank you !

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Harry

15 months ago

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Please provice more details via email to support@geekworm.com

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Anonymous user #27

13 months ago

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Hello, I need the same. Did they finally help you? Could you help me?

I have a Li ion battery in very good condition and at 1% capacity it can work for hours. The capacity reading is wrong.

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Walker

13 months ago

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"Anonymous user #27", you can contact us via our email: support@geekworm.com we will do our best to solve your problem

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Anonymous user #25

17 months ago

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Hi, is it possible to change out the fan on this board for another 30mm fan or 40mm with an adapter? I would like to use a full silent fan solution but I want to make sure that replacing the fan is possible. I assume the fan is 5V?

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Walker

17 months ago

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Hello, the fan of X708 is 30x30x10mm, you can replace it with a 30mm silent fan

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Anonymous user #24

17 months ago

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Hi I tried to connect battery low led to external PH2.0 connector but it seems like it does not light up when battery low blinks on the board and when i run continuity test on that connector (when board is off) there is a short between pins 2 and 3 to ground.

I have X708 v2.0, is this my board's fault or schematic has changed for external power switch? It seems like it was reworked to adapt for 4 pin momentary switch with led light (so pins go like this power on/gnd/gnd/power led)

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Anonymous user #23

17 months ago

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Is there a way to add the x708 sotware to the home assistant, if so, which commands?

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Walker

17 months ago

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Hello, we have not tested it and cannot give an exact answer

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Anonymous user #10

18 months ago

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Solved the problem that the old version can't charge when the battery is exhausted -ver2.0

An m.2 SSD (X862) error occurs on reboot after a full discharge of the Raspberry Pi battery. The power is on, but it does not boot.

Is it related to the above problem?

Are there any precautions when recharging after full discharge?

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Walker

18 months ago

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Hello, according to your statement, we are not sure whether it is related to your above problem. We suggest that you remove the X708 and test again to see if the above problem still exists. If there is still a problem, please provide your order number. If possible, you can provide some pictures (about your question), preferably a video, and send it to our email. Please contact us at support@geekworm.com. We will try our best to help you solve the problem.)

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Anonymous user #22

25 months ago

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Hi, please what case fits for x825 v.2.0 + pi4 + x708 v.2.0 + 18650 battery holder?

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Lisa

25 months ago

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Hi，

There is no a case for Pi4 + X825 V2.0 + X708 + 18650 bateery holder yet. But we will be pruducing a matching Case for it in the near future.

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Anonymous user #21

25 months ago

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Lithium-ion battery are wearing when kept fully charge all the time.

To preserve the battery longevity is it possible to limit the maximum capacity/voltage charge ?

For Example I would like to limit the charge at 85% maximum.

Thanks !

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Anonymous user #20

25 months ago

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What is the total idle/quiescent current draw from the battery to the X708, when the X708 is switched on (not in sleep mode), but there is only a very small current (a few uA) drawn on the output?

In other words, what is the X708 battery current just for it to be switched on?

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Lisa

25 months ago

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Standby current is normally less than 1mA.

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Anonymous user #20

25 months ago

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Your specs say the max output current is 6A, and the max charging current is 4A. But on the datasheet for the IP5310 which is shown on the X708 PCB, the max output current is 3.1A and max charging current is 3A...

So, which is the correct specification? 6A out and 4A in, or 3.1A out and 3A in?

Also, if 6A and 4A is correct, how did you manage that if it is more than what the IP5310 can provide?

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Lisa

25 months ago

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Hello，

IP5310 is only used for battery charging

there is other DC/DC boost converter which can deliver output current upto 6A.

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Anonymous user #20

25 months ago

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I see, so since the IP5310 is used for charging, the maximum charging current of the X708 is 3A?

Also, what is the name/part number of the 6A DC/DC boost converter?

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Lisa

25 months ago

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1. Max charging current is 3A 2. We have two DC/DC bosst converters, one is TPS61088RHLR from TI and other one is 2187 from our local.

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Anonymous user #19

27 months ago

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Can I simultaneously connect a lithium polymer battery in xh2.54 and another lithium polymer battery in ph2.0?

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Lisa

27 months ago

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Hi，

We do not recommend this.

Please use batteries of the same size.

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Anonymous user #18

28 months ago

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Can I get the x708 v2.0 schematic.

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Lisa

28 months ago

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Hi,

We can provide PCB size pictures, but can't provide schematic diagrams

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Anonymous user #17

32 months ago

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Can i engage both XH2.54 and PH2.0 connectors at the same time by adding both kind of batteries. Or X708 can connect one kind of battery at one time.

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Anonymous user #17

32 months ago

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Got the answer from Anonymous user #10

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Anonymous user #10

32 months ago

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How can the x708 board automatically shut down hardware at the same time when the raspberry pie 'sudo shutdown' ends?

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Lisa

32 months ago

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Hello，

Please refer to X708-Software-- How to power off command on Raspbian from software.

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Anonymous user #10

32 months ago

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How does the x708 board automatically shut down hardware at the same time when the raspberry pie ends?

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Anonymous user #16

33 months ago

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It is appear x708 do not charge batteries in power off state. USB tester shows 5V/0.02A and batteries do not charged after 10 hours.

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Lisa

33 months ago

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Hi，

The x708 can charge the batteries in power off state.And the battery indicator flashes to show the charging status.

Please check whether the power supply is connected to the x708 and whether the power supply is in poor contact.

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Anonymous user #16

33 months ago

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After some testing I can say it do not charge battery at all. External power supply is connected, LED flashing, but there is no 4.2V on battery pins, only current battery voltage (according charged level). I use 18650 Li-ion battery in x728

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Anonymous user #15

35 months ago

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Hello, I have this and currently using 18650 lithium-ion 3.7v cells.

Is it possible to use 18650 3.2v lifepo4 cells?

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Lisa

35 months ago

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Hello，No，X708 Terminal Battery Voltage : 4.24V; please refer：FAQ 4: Which lithium battery can be used:

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Anonymous user #14

36 months ago

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Hello can I use X708 with x728-A2?

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Lisa

36 months ago

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Yes，x708 can be used with x728-A2； please refer to x708-A1 for connection method

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Anonymous user #10

37 months ago

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4010 fan is not working through 5v XH2.54-2P.

I'm looking for a noiseless 4010 fan. Please recommend something.

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Lisa

36 months ago

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Hi，Please check if the 4010 fan is connected reversely.

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Anonymous user #13

38 months ago

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Can I use a latching rocker switch to power up the system from the power switch pins?

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Lisa

38 months ago

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Hi， x708 only supports 4pin external switch. not supports rocker switch.

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Anonymous user #12

39 months ago

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What parameters does the 3010 cooling fan have? Installed by you does the job, but it is loud. Can I replace it with a quieter one? If so, I need information, voltage V, current A, power consumption Watt.

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Lisa

39 months ago

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Hello，You can replace a 5V 3010 cooling fan if you want.

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Anonymous user #11

41 months ago

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How to enable 'AUTO POWER ON' or 'AUTO ON' function?

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Lisa

41 months ago

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Hello，please refer here：https://wiki...708-Hardware

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Harry

39 months ago

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refer to X708-Hardware

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Anonymous user #10

42 months ago

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Can xh2.54 (two batteries) and PH2.0 (two batteries) be used at the same time?

I want to use a total of four batteries.

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Lisa

41 months ago

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Hello，We don't recommend that. If you want to use four batteries or more, we recommend connecting the X708-A1 18650 Battery holder, which can support up to 8 batteries.

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Anonymous user #9

44 months ago

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Hallo ,

Iste s möglich den Lüfter dieses Board's per Termperatur zu steuern wie beim board x730 ??

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Lisa

41 months ago

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Hello，sorry ，It does not support temperature control

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Anonymous user #7

47 months ago

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The battery picture is wrong, it states to use battery with buildin pcm or pcb (protection circuit module/board) but the battery may not be longer the 65,3...

the 67mm are the only ones with pcm / pcb, that whats the button on top is for. there are no batterys with pcm/pcb at the length of 65,3.

those are all with pcb/pcm

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Anonymous user #7

47 months ago

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correction:

those 65.3 flat tops are all WITHOUT pcm

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Xiali

47 months ago

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Hi dear , sorry for the mistakes ,In fact ,It doesn't matter whether the battery has a protection circuit or not, the most important thing is that the size of the battery can fit the battery holder.

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Anonymous user #8

47 months ago

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thx for the quick answer, i have ordered one locally

keep up the good work at geekworm with hats and support

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Xiali

47 months ago

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Hi dear ,There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

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Anonymous user #4

49 months ago

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Like the other poster mentioned I do not think 18650 with protection circuit will even fit this board.

Can you please confirm/correct the information about the protection circuit?

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Indigoson

49 months ago

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FWIW, I'm using a married set of LG HG2s (married here just means that they've always been used together, never as individual cells; it's likely unimportant here, as the power draw is minimal). These are unprotected, high-capacity, high-drain LiON batteries that can be had at places like IMRbatteries dot com for a few bucks a pop. Highly recommended.

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Georgefeichter

50 months ago

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Where do I find the code "getACPSUStatus()" to the answer to question 2 ?

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Georgefeichter

50 months ago

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It is a shame that the software for the X708 does not appear to be working. I have posted questions on https://rasp...708-Software and my question is being ignored. The command 'x728off' does not do anythng. The command line reply is 'X728 Shutting down', but nothing happens.

Any ideas anyone?

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Anonymous user #5

49 months ago

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It definitely works. I just received mine last couple of days. You must have missed an enabling step, also be sure that you have power connected to x708 and not the PI directly.

1. Enable i2c 2. Reboot 3. clone x728 project from github 4. Open x728.sh and comment out first four lines 5. Install the x728 features/scripts

6. sudo x728softsd.sh #shut it down

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Anonymous user #6

49 months ago

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do we have a step by step guide to do this? what is the enabling step? i would appreciate a noobs guide please thanks!

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Anonymous user #2

50 months ago

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Q:What battery is recommended for X708?

A:Please use big brand and high quality batteries, like PANPASONIC, Toshiba... Also the batteries for X708 must have built-in protection circuit.

Harry

2 days ago Score 0++ In fact, you can use the 18650 battery witout safety circuit, and it's more better.

WHO ARE YOU HARRY TO SAY THIS?

WHAT IS THE CORRECT ANSWER?

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Xiali

47 months ago

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It doesn't matter whether the battery has a protection circuit or not, the most important thing is that the size of the battery can fit the battery holder.

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Anonymous user #3

50 months ago

Score 1

Hi.

Is it possible to turn on/off fan from software or control fan speed?

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Xiali

47 months ago

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Hi dear ,The X708 can turn on/off fan from software but cann't control fan speed,By the way ,There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

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Anonymous user #2

50 months ago

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Which is it a battery WITH built-in protect circuit or WITHOUT???

Will this fit the n300 case?

Is I2C address changeable?

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Xiali

47 months ago

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Hi dear ,tks for your message , 1.It doesn't matter whether the battery has a protection circuit or not, the most important thing is that the size of the battery can fit the battery holder. 2.It can fit the N300 case? 3. I2C address can not changeable?

4.There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

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Anonymous user #1

51 months ago

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I have not found any 18650 Lithium ion batteries with a safety circuit that are 65.3 mm long. All of the 18650 type batteries with a safety circuit are 68-69 mm long. Comments??

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Harry

50 months ago

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In fact, you can use the 18650 battery witout safety circuit, and it's more better.

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