






III. Functional Modules
Charging uses a common 6P USB interface, a standard design, which requires no further explanation. D1 is an anti-static diode.
uses the AP5056 charging chip, which is also used on the 01-RTC main control board 
, reflecting a cost-saving and efficiency-enhancing approach. This chip is compatible with the TP4056. U1 is a resettable fuse with a rated current of 1A, a trip current of 2A, and a maximum voltage of 6V. Both diagrams show the charging current control. The first diagram is for version V1.1, where current control is achieved through jumper pins. The second diagram is for version V1.2, where current control is achieved through a single DIP switch.
uses the common DW01 and 8205 chips for charge and discharge protection. The schematic is copied; I will study it further later and refine this part. 
The four screw holes, besides their mounting function, can also be used as power input and output, essentially providing an additional interface for charging to adapt to different scenarios.
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