
I found myself in need of a rechargeable battery tester, so I went off to search the internet for a DIY tester.
I was pleasantly surprised to find that John Lowen, had built a Rechargeable Battery Capacity Tester (v2.0), and also developed the PC interface software for desktop use.
Even better I found that Paul V. had also built the same tester and had made several improvement in the design and software.