Multimeter 6F22-9V lithium battery

An overnight meal - the multimeter uses a 9V battery.

Output voltage: 9V

Output current: 50ma

Standby quiescent current is less than 10uA.
Start boosting when the load is greater than 2.xmA in standby mode.
When the battery voltage is lower than 3.5V, the output voltage is reduced to indicate that the device needs to be charged in time.
The low voltage threshold adjustment can be set according to the instructions in the schematic diagram.

With low battery status output (lowering the output voltage to allow the device to recognize low voltage), the threshold is adjustable.

TYPEC charging interface with 4-light power display.

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TPS61040, the load is 8ma and the ripple is as shown below. The output current of this chip is relatively small, but there is no problem with using a multimeter.

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MT3608, the load is 9ma ripple, no problem. The output current is larger.

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Next comes the grand debut of FP6291, which is HIGH. Is the chip in my hand a fake? I can't remember where I got the chip.