Replace just 1-2 bad li-on cells? Answered
I've got a fairly new DeWalt 20V Lipo Battery pack that got a bit of water inside it's case, causing 1 of the 10 cells inside to go bad.
* Battery pack is configured as 5x2 (5 series stages of two parallel pairs each)
* Other cells are in near-new condition.
* OEM Factory battery exact matches are rare and quite overpriced. (1500mah x 15A discharge rate @ $10-20 shipped.)
* Due to improvement in battery tech, I can get batteries that outperform OEM in every spec for 30-40% of what the OEM costs (2500mah x 20A discharge rate @ $4-6 shipped.)
* The battery pack is always charged on a cell-balancing charger.
Assumptions: (Correct me if I'm wrong here, especially on the 2nd one)
* The partner cell to the dead one is now suspect, due to being undercharged (down to <.1V) by it's dead partner.
* I should be able to just replace the bad cell and it's partner with the higher spec'd batteries and it shouldn't be a problem
Is this workable, or will having non-identical cells for 2 of the 10 cells cause problems? (I'm totally fine with the pack only being as strong as the weakest link, and only getting OEM performance out of the replaced cells.)
I'd rather not have to replace all 10 cells, but I'd rather do that than replace 2, and -then- have to replace all 10 because the combination didn't work.