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2015-12-29 23:36:30 Post No. 921973
Post No. 921973
I have a bunch (like 50) LI-ION cells I tore out of defunct / damaged drill batteries (which I've been calling makita cells) and I'm wondering about testing them. I want to be able to graph their discharge cycle and record their true mAh.
First thought about this was have a constant current (or do I need a constant voltage?) load and use an arduino to record the voltage and time, and put it into a csv or something I could graph nicely
However looking online, I've seen things like this http://www.ebay.com/itm/Lipo-Battery-Cellmeter-Balance-Discharge-Capacity-Internal-Resistance-Checker-/271906393076
That got me wondering: Should I build or should I buy? $5-$10 canadian pesos is cheap enough, and if I have to order the components for what I build anyways, why not get something with a case, and that's built better? Does anyone have experience with buying or building a cheap battery discharge grapher / logger? Does anyone know of a good, cheap battery discharge logger I can get off ebay (that preferably has usb for logs) ?