The Rack Battery Design and Build Ebike battery packs are made from lithium ion cells which provide 3.7v (3.6v for ours) nominal voltage and charge upto 4.2v and can go down to around 3.1v safely with longevity. When cells are connected end to end (serial) the voltages are combined, so 13 cells end to…
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The Rack Battery
![The Rack Battery](http://dcrark.com/dcrark/distilling/wp-content/uploads/2020/09/IMG-20200927-WA0008b-200x150.jpg)