Roomba 500 series battery case
thingiverse
Battery terminals made from alkaline battery negative terminal. Thermistor terminals made from nickel strip 5 mm. Use utility knife to fit all parts. Note: Using Battery Management Circuit(BMS) is absolutley necessary! Roomba designed to use NiMh batteries. Fully charged NiMh batteries has higher voltage than Li-Ion(19.2V vs 16.8V) and charging with constant current. When voltage exceeds 16.8 volts BMS break battery connection with Roomba to prevent overcharging. As result Roomba will show Charging Error 5. To prevent that you need to add circuit inside battery to cheat Roomba with high temperature readings when battery is charged. More info at GitHub: https://github.com/nickshl/RoombaChargeLimiter
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