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My understanding is that used laptop batteries are particularly good for this sort of thing, because what happens is that one cell (out of six or nine) dies and
by mustafa_pasi 6y ago
My understanding is that used laptop batteries are particularly good for this sort of thing, because what happens is that one cell (out of six or nine) dies and the laptop battery becomes unusable since they are wired in series, and then you have five (or eight) used but relatively healthy cells to reuse.
I am not sure whether the same idea could be applied to a car battery with much more advanced battery management systems, since in those situations dead cells don't cripple the battery, so the other cells keep getting used until they lose efficacy. So I suspect cells scavenged from car batteries will be of lesser quality than those scavenged from laptops.
Not totally sure if I have it right.
- mmaurizi 6y agoI'm imagining for a more advanced BMS system that manages dead cells for you, you don't scavenge cells but instead use the battery pack as a whole unit, just separated from the car. Think something like a conversion kit that turns your Model 3 battery pack that you've removed from your car into a powerwall.
- rootusrootus 6y agoPeople on the DIY solar forum already use old Tesla batteries for powerwalls so there’s likely to be kits in the future to make it plug and play.
- kube-system 6y agoNot sure about EVs, but replacing single dead cells is common on hybrid vehicles. It's pretty common for them to be series'd up as well.