Charging is linear charging, optional CN3162 (ordinary lithium battery) / CN3058E (lithium iron phosphate) / CN3155 (lithium titanate, the buck chip supports 100% at low voltage, that is, pass-through)
For discharging, I chose TI's TPS62740, a DC-DC step-down, and the quiescent current seems very low (?) less than 1uA;
The reserved space supports four voltage output levels of 1.8v/2.2v/2.9v/3.3v
The charging port is Type-C with indicator light
Board size 24mmx11mm, 0.8 or 1mm thickness recommended
I used it to modify the Rapoo 29.9 mouse.
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