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Introduction |
How to rebuild an Alber e-motion M15 battery that has suffered the very common failure to charge. This happens due to a failure of a cell or even more commonly due to the cells dropping below the cut off voltage. At this point there's no recovering them and you're at the mercy of a company that charges hundreds for a few nuts and bolts, let alone a few cells. [br] | | [br] | This happens due to a failure of a cell or even more commonly due to the cells dropping below the cut off voltage (update 2.85v on average on the last battery I had that failed). You're now at the mercy of a company that charges hundreds for a few nuts and bolts, let alone a few cells. Assuming you can find one that sells them as it's looking increasingly like they've been discontinued. [br]
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I could find zero information for rebuilding what iswas otherwise a $700+ per wheel replacement for a battery that can very easily go under voltage due its lack of battery management and only one Polish company willing to rebuild them. Hopefully even if you don't feel able to rebuild the battery yourself, you can send a link to someone who will see it's not a job they should worry about taking on. | | Please forgive the fairly limited photographs, they were to remind me of layouts at the time but I'll try my best to make it into a guide. I've now gone back and added some extra photos from a second rebuild which hopefully will make things a bit clearer. Please forgive its failings but hopefully it will save somebody some money. Maybe it will also be enough to convince some of the wheelchair battery rebuilders to actually touch these as they're very simple rebuilds for them. [br]
When I tear down the other battery in the future I will provide more photographs. [br]
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The existing cells removed can be recharged in a decent quality li-ion charger back to usable state. However I strongly recommend you resist the temptation to reuse what are likely to be decade-old lower capacity cells as m15 batteries will be getting rare now if they are indeed discontinued and you want to be rebuilding them as rarely as possible. On the plus side, with care, the batteries should be repeatedly rebuildable. [br]
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