Battery tab spot welders do come up on ebay from time to time or its something an electronics hobbyist could make themselves.īefore we start with the dismantling, remember that even if your batteries do not work anymore they most likely still contain a significant amount of energy. If you do need to replace cells spot welding to the cells is the best way to go, as if you solder you risk overheating. Makita seem to use the Sony Konion LiMn cells and these are available online for between fire and ten pounds each or you can frequently pick up failed batteries on ebay and cannibalise these for parts. I will be concentrating on replacing the battery control board as frequently this is all you need to do to get things up and running, although if you do require new cells these can be changed pretty easily. Once you get the red / green flashing lights three times on the charger your battery control board locks the battery from being recharge again. This causes the battery to be unbalanced. It seems there are two main failure causes, number one over heating and the second is the first two cells fail due to them being used to power the battery management chip and slowly discharging over an extended idol period. Out of the eight batteries I have purchased over the years four have failed out side of the warranty period, plus two failed within or just after the end of the warranty and were replaced at no charge by Makita. In most cases I rarely if ever use the corded tools they replaced, despite this there does seem to be a major week point, the batteries. ![]() I have been a big fan of the Makita 18v LXT cordless tools for several years now.
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