My first crack at rebuilding a failed Ryobi Battery, repairing the Ryobi 1.5ah battery with used NCR18650 laptop battery 18650 cells.
Can't be sure but I think the battery failed due to issues with the BMS, however, BMS may have been damaged by me spot welding but I'll never really know. The end result was I now have a working battery with 2.8ah capacity for low drain applications.
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Pete
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