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There are other Arduino powerered battery testers, but this one is mine. I took some trouble with the documentation.

This is awesome, I appreciate the docs!

I switched to NiMH a few years ago and am so happy about the reduced waste.

This is really, really cool. I might actually build one, but for SubC cells. I just bought a new 7c 5000mah NiMH pack yesterday for my Tamiya High Lift crawler because my old 5000mah is starting to go. I got about 3,000mah out of my last run according to my charger.

But my charger has no discharge function, and if charging takes over 90m I must write down the MAH and restart the charger to start from 0. It can be frustrating. Your device would be very useful for me.

Nice work. How does this method of evaluating batteries compare to measuring a battery's resistance as found on some chargers?

Hmmm.

Resources left on the board are: One Arduino I/O pin (the TX one), one unused relay. That could be used for one of the six channels to decrease the load resistance slightly by splicing in a parallel load resistor. By measuring the voltage drop from momentarily increasing the load, the ESR could be computed, at least roughly, for that one battery position.

Show HN: NiMH Battery Tester