Hardware revision C
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1. Major redesign, the board remade in KiCAD (Eagle CAD was used in the past);
2. The battery charger chip changed from MCP73833 to TP4054-42-SOT25-R, a lot of related components were changed or deleted;
3. USB connector changed from USB type MINI to USB type C;
4. BAT connector changed from DW02R(PTH) to PH2.0-2PWB(SMD);
5. Everything on the board rearranged, TERM pads removed, second battery pads removed, LEDs reduced to one to fit the new charger;
6. The only thing, that remains the same, is the size of the pcb.
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Hardware revision B
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1. Fixed + and - white print at the bottom of the PCB