https://www.youtube.com/watch?v=nEl5xvB9J-I
https://www.youtube.com/watch?v=nEl5xvB9J-I
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I like the simplicity of the ends of your battery packs. those batteries are good choice for a power supply too. I use them with some flashlights and keep finding new applications others are using them for too
A good choice, using laptop batteries for an electric bicycle.