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'''WARNING!!!'''
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;">'''Important：1,Please be sure to install the X728+ Raspberry Pi in the correct order. The copper pillars must be fixed before installing the x728. Avoid short circuit caused by the X728 board touching the USB connector of the motherboard, which may cause the chip to be burned. 2,When installing the battery, you must check and confirm the positive and negative poles.
X728
,No any functional changes; just change the SMD 18650 battery holder to a pin battery holder to improve the reliability of battery holer soldering.
<span style="color:red;">'''WARNING!!!'''
* <span style="color:red;">'''Please be sure to install the X728 and Raspberry Pi in the correct order. The copper pillars must be fixed before installing the x728. Avoid short circuit caused by the X728 board touching the USB connector of the motherboard, which may cause the chip to be burned.
* <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 "-". '''
===X728 V2.2===
Adds Battery Reverse Polarity Protection circuit & LED indiciators on v2.2
===X728 V2.1===
* Added power input connector, which can be used with X715 to achieve 6~60V wide voltage input.
* PCB Size change: 87x63.7mm
'''