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Batteries to the Future | Fully Charged
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Sep 23, 2016
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What does a kilowatt hour look like?
It's pretty safe so long as you use a battery controller with appropriate monitoring to prevent overcharging.Recycled 18650 cells that have worked fine in laptops for years are very unlikely to suddenly explode on you for no reason. I'd be more worried about the mystery Chinese ones you can get new on the web!
Here's some Materials Science students at Oxford who built packs using recycled laptop cells. They used controller software that monitors the health of each individual cell:
https://m.youtube.com/watch?v=RW1Xugey8j0
(It's towards the end of the vid)
⬐ whamlastxmas>very unlikely to suddenly explode on you for no reasonIt really depends on their condition. If you get some cells from a laptop and they've all fallen down to reading 1 volt, then yeah repeatedly charging them (especially at a high amperage) is going to be pretty dangerous.
⬐ gravypodIt's still not the best idea unless you can control the draw from each cell individually. Hooking these up in parallel is a horrible idea.⬐ NoneNone