In this tutorial, I demonstrate the process of rebuilding a 13S 6P lithium battery pack for a junior dirt bike, which had sustained water damage. The project involved replacing all the damaged cells with ones salvaged from other battery packs, taking around three hours to complete. Remarkably, I managed to salvage 64 out of 65 cells from the original pack and used them to construct a new one by combining them with additional used cells.

The key to success in this rebuild was carefully matching the battery strings using the Mega CNC and rigorously testing the cells with a Megacell Charger. Dive deeper into the specifics of this effective cell testing technology here:

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