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[[File:X735-IMG-5921.jpg|thumb|right|X735 Metal Case]]
X728
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[[File:X728-IMG-7956.jpg|thumb|right|X728 ups board-Front]]
[[File:X728-IMG-7957.jpg|thumb|right|X728 ups board-Back]]
[[File:X728-IMG-7975.jpg|thumb|right|X728 ups board]]
[[File:X728-A1-IMG-8199-Packing-List.jpg|thumb|right|X728-A1 Packing List]]
[[File:X728-A2-IMG-8211-Packing-List.jpg|thumb|right|X728-A2 Packing List]]
[[File:X728-PCB.png|thumb|right|X728 PCB Layout]]
{{GD Template Impl}}
==Overview==
The X728 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 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 real- time clock.
The X728 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X728 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.
==SAFETY INSTRUCTIONS AND WARNINGS==
* <span style="color:red;">You must read these safety instructions and warnings before charging your batteries.
* <span style="color:red;">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.
* <span style="color:red;">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 "-".
* <span style="color:red;">Do not mix and use old batteries and new batteries, or batteries with different brand names.
* <span style="color:red;">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.
* <span style="color:red;">When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X728 on the wood material or carpet and unattended.
* <span style="color:red;">Must keep the X728 away from children.
*Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/
==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===
<span style="color:red;font-weight:bold">X728 18650 UPS + Power management board</span>
* 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 8000mA Power Backup for even the most demanding RPi set ups
* Can work with [[X728#X728-A2|X728-A2]] stackable 2-cell battery holder to increase battery capacity
* Supports 3000mA 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
* On-board 4 green LEDs indicate battery charging and discharging levels of 25%, 50% , 75% and 100%
* 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 through 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 detection)
* On-board pin header allows to select auto power-on when power supplied
* Automatic safe shutdown when battery low (voltage <3.0V)
* Ultra-low standby power consumption to maximize battery life
* Operate in both charge mode and boost mode to allow full system management and battery power management
* 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
* Integrated Hardware DS1307 Real Time Clock (RTC) with Battery Back-Up
* Keeps track of the time while the Raspberry Pi is switched off
* Allows the Raspberry Pi to retrieve the current date and time when it is switched back on
* Uses the 18650 battery to maintain the date and time - no additional battery required
* Powers the Raspberry Pi via the 40-pin header - no additional cabling required
* On-board 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
* Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards
===SPECIFICATION===
* Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A
* UPS output : 5.1V ±5% Max 8A
* UPS charging current: 2.3~3.2A
* Terminal Battery Voltage : 4.24V
* Recharge Threshold : 4.1V
<span style="color:red;font-weight:bold">Note:
* <span style="color:red;font-weight:bold">Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket.
* <span style="color:red;font-weight:bold">Do not use 18650 battery with built-in protection circuit
==Packing List==
* X728 Expansion Board x 1
* Screw M2.5 *5mm x 8
* Spacer M/F M2.5 *20mm x 4
* Spacer F/F M2.5 *20mm x 4
* Jumper link Pitch 2.54mm x 3
==DocumentX728-A1== <span style="color:red;font-weight:bold">X728-A1 Optional Raspberry Pi cooling fan</span>* Completely solve the overheating problem of your Raspberry Pi* Efficient drop temp of your Raspberry Pi by using the X728-A1* Stackable design allows you to connect both X728 and X728-A1on your Raspberry Pi* On-board XH2.54 power output connectors allow to power other devices* Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards* '''X728-A1 supports [[X750]]/[[X758]] also.''' ==X728-A2==<span style="color:red;font-weight:bold">X728-A2 Optional 18650 2-Cell battery holder</span>* Stackable 18650 two cells lithium Ion holder* Ideal solution to increase battery capacity* Integrated battery protection circuit ==User manual==* [[x728-Software]]* [[x728-hardware]]
==FAQ==
Q: Why X728 automatically shuts down?
A:
1. X728 will automatic safe shutdown when battery voltage is low than 3.0V, please charge in time;
2. Please try the following operation by step:
# Remove all jumper cap,
# Remove all 18650 battery
# Place 18650 battery again and wait a few seconds before testing
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