Li-ionBuddy

A LITHIUM-ION BATTERY TESTER POWERED BY A PI

If you're like me you've got quite a collection of Li-ion batteries salvaged from of old gear. Wouldn't it be nice if you could determine if they were any good, and maybe determine their current milliamp-hour capacity? This project lets you do that for very little cost!

But first, lets get something out of the way. This project could be better done with an Arduino. Or you could probably buy an inexpensive device that does the same job. But a Pi and a well-stocked parts bin was what I had on hand. And anyway, I wanted to test my analog input method: it was just a concept until I used it in this project.

Initial design:

refined design:

calibration data from the analog to digital converter, and a curve fitted to it

368,4190

378,4074

396,3929

415,3779

426,3693

493,3297

539,3078