Last Update: May 10, 2018
The lithium-ion batteries in modern electric cars made the electric car practical in a way that lead-acid and NiMH batteries did not. Likewise, lithium-ion batteries can revolutionize energy storage systems making them practical for everyone. It is not hard to build a battery pack, just make sure to ignore those proclaiming battery management systems are a waste of time. With lithium-ion batteries, battery management systems are essential for safety and reliability.

DIY Lithium Batteries: How to Build Your Own Battery Packs
Written by a leading eductor on building electric bicycles and battery packs this is an excellent introduction to battery packs. Since his background is electric bicycles, it seems the focus of the book is on packs sized for that application. It discusses techniques for soldering or spot-welding 18650 cells together into packs small enough that shrink-wrap is an effective battery enclosure. The information is excellent, and well thought-out.
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