These are the PCBs I ordered from OSH Park. Falsely I ordered a 4 place DIP switch when I needed a 3 place. The charger seams to work well even though I didn't have the opportunity to test it long enough since it charges the batteries really fast. The DIP switch selects between 0.5A-2A charging current with a 0.5A step.
The goal is to implement a modular and configurable charger which can adapt to the given battery configuration.
The charger needs a 2A 5V power supply, which fairly common.
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