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Joined 2 years ago
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Cake day: June 10th, 2023

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  • That looks like a battery protection PCB, yeah. It usually does three things:

    • over voltage protection
    • undervoltage protection
    • overcurrent protection
    • reverse polarity protection

    Bypassing it would be a bad idea, but it’s also pretty rare they fail. Maybe it’s just in undervoltage protection mode. Try to hook up your variable power supply with 4.2V and a 50-100mA current limit to the battery tabs (check polarity!) and see if the cell takes current. Above 3.6V the battery protection should lift and you should see voltage on the battery output terminals.


















  • I’m doing a hardware interface for baby buddy. The platform is based on an esp32s3 with:

    • round display with touch
    • 10x Kalih choc switches
    • rkjxt1f42001 (nice part, encoder+four direction)
    • Ambient light sensor (to adjust backlight automatically)
    • 9-dof IMU (because why not)
    • battery controller and fuel gauge from TI

    It was a pretty challenging design, first time soldering BGA ICs and using solder paste/stencil! Also, hard deadline :D

    Will open source and publish HW and code (written in rust) soon!