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X728
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[[File:X728-PCB.png|thumb|right|X728 V1.3 PCB Layout]]
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==X728 V2.1 is released==
V2.1 is released on 23th Sep. 2021;
Update:
* Use the big brand battery protection chip
* New add a buzzer controled by CPIO20
==X728 V2.0 is released==
*1. Improve the power path function, the battery will only charge and not discharge when connected to the PSU(power supply unit). [The PSU power will charge the battery and also pass through to the RPi when it has power. If the PSU loses power (power failure), the X728 will switch over to battery power.]