What is (was) inside my KH980 cell charger

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Well since I bought a new charger, it was time to open my old KH980 (Tronic),
and see what was inside…

The reference design is by ‘SANWALL’ : it mentions PCB-BC-9-MCU (rev. 3).
The MCU is referenced : SH69P55AF (Sino Wealth : 4bit OTP MCU, see following link)

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