A DIY Charger That Makes NiMH Batteries Easy to Use

Lithium-ion batteries’ ability to deliver a lot of power from a small package have made them the go-to for makers and manufacturers alike. It’s not unusual now to find, say, microcontroller boards with integrated Li-ion chargers. Lithium-ion is so popular, in fact, that it’s easy to forget that other battery technologies exist, even when they’re a better fit.

These worthy alternatives include removable rechargeable nickel–metal hydride batteries. While NiMH cells can’t be recharged as many…