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Circuit principle: The circuit is supplied with +5V power supply voltage by transformer, diode and voltage regulator IC7805. The battery voltage is divided by resistor R5 and R6 and sent to the BAT end of the chip to provide sampling voltage. The resistance input to the BAT terminal of the resistor divider network should not be less than 200kΩ. When the TM terminal is grounded, the corresponding fast charge rate is 1C, and the fast charge time is 80min. 
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