I often hear that it’s hard to find someone who’ll rebuild battery packs because it’s not worth it and can be dangerous, so it’s easier to just buy a new one. But from what I understand it’s just a series of smaller batteries all linked together?
Rebuilding seems even easier than building from scratch, just desolder the old batteries and swap them for new ones. Bing bang boom job done. …so how likely is the boom part? lol
What is it that can so easily go wrong that makes people say don’t attempt this on your own?
In: 11
Because cells in parallel groups are matched to each other by their internal resistance, so that all of them experience the same voltage sag under load and thus age together more or less equally.
When you replace some of the cells in the old battery with new ones they will naturally have lower internal resistance, and will be delivering more power than the aged cells around them. This will lead to their rapid aging and overload/overheating.
The physical process itself is also quite dangerous due to the energy densities involved and the damage that an accidental short circuit might cause.
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