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I try to build a little circuit that will control a charge/discharge maintenance cycle for my removable EV battery packs when my bike's in long-term storage pending sale.

I turned out to be a marathon not a sprint.

Using A Raspberry Pi, an INA237 power monitor chip, a pair of relays, a pair of MOSFETs (the source of much confusion), the battery's supplied charger and a 100W load. Here's what I did.

Programming was done in Python and is very basic as it's not my normal weapon du choix.

The INA237 chip communicates over I2C and has a trap built in for me!


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