CJonaBttlrckt
100 W
I really only want about fifty cells, as I was hoping to get another year or two out of my relatively recently purchased battery, with a bit of cell replacement.
There seems to be a few parallel packs that aren't keeping up.
I'm not confident the BMS isn't the cause.
Cheers,
Clinton
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Disconnect the BMS and add a 80A MCB, monitor packs manually for a few rides. If you want to fix an existing assembled pack it can get tricky. try and identify what you have so at least you can replace with same cells.
18650's are very reliable, in fact CD is so confident he doesn't run a BMS at all AND rarely does he need to balance them.
Personally I have made DIY powerwalls etc and dud cells are typically flat and have internal damage/ whatever elsea that causes them to heat significantly during charging and they die quickly afterwards. AS for new cells it is VERY rare to have any problems. so rare in fact TESLA use ~10,000 in a P90D, whilst they have cell level fuses in real life I dont think anyone has ever seen one popped for any reason.
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Hi and thanks Karl,
I have three packs ready to swap out and will probably bypass the bms and try monitoring and balancing manually, for a while at least.
I've manually balanced previously and found after only a couple of cycles, the same packs are down again and if left for a while I find these same packs down, usually by more and also other packs also down.
Of note, I've used the cells I already replaced to build a makita battery and it's working fine...hence I suspect the bms is the problem.
If it's not the problem, it certainly doesn't seem to be helping given the low voltage of some packs, which were down by +0.5v at last check.
Thanks again,
Clinton