redsnapper Posted December 15, 2020 Share Posted December 15, 2020 I have a buddy who bought a onewheel XR then let it sit for 12mos (yes don't get me started on his stupidity!). Now his batt is below min and will not charge. I have heard of using a balance charger to bring low cell groups up to a min threshold so that the normal charger can be used. I am aware this requires that cells have not gone to 0v etc. (I would test all cells in advance to make sure) and that some permanent impairment may result from the pack sitting idle so long. I have not got the pack yet but I soon will as my buddy drove back from US with his dead onewheel. Any thoughts on attempting to bring this pack up to min voltage etc. Quote Link to comment Share on other sites More sharing options...
null Posted December 15, 2020 Share Posted December 15, 2020 (edited) 1 hour ago, amelanso said: I have heard of using a balance charger to bring low cell groups up to a min threshold so that the normal charger can be used. I kind of did this once and it worked for a while, but the damage was already done and the cells kept getting out of balance. The safer bet is probably to have the battery redone (hobbyists do it, there are probably services doing it?) if the official ones are too expensive / not available. The public at large must be killing mountains of PEVs this way, and when you try to give them some recommendations the reaction is something like "yea sure" and nothing is done.. edit: If you have a charger for individual cells you could always try and keep an eye on the evolution. Edited December 15, 2020 by null 3 Quote Link to comment Share on other sites More sharing options...
smallexis Posted January 16, 2021 Share Posted January 16, 2021 First step is to measure how much volt for each group cells. If it's under 2,5V chemical reaction is damaged and there is no interested in trying waking up cells. 3 Quote Link to comment Share on other sites More sharing options...
M640x Posted July 10, 2021 Share Posted July 10, 2021 On 12/15/2020 at 7:16 AM, redsnapper said: I have a buddy who bought a onewheel XR then let it sit for 12mos (yes don't get me started on his stupidity!). Now his batt is below min and will not charge. I have heard of using a balance charger to bring low cell groups up to a min threshold so that the normal charger can be used. I am aware this requires that cells have not gone to 0v etc. (I would test all cells in advance to make sure) and that some permanent impairment may result from the pack sitting idle so long. I have not got the pack yet but I soon will as my buddy drove back from US with his dead onewheel. Any thoughts on attempting to bring this pack up to min voltage etc. I wouldn't bother with measuring voltage, etc. Get another battery pack. They can be had all day long on either facebook group Onewheel marketplace or Onewheel only Parts and Products. Quote Link to comment Share on other sites More sharing options...
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