Do this and get into DIY.
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If you do the math the stock battery has a max charge amperage of 6a per parallel pack, the 20a quick charger is doing 5a per parallel pack which is close the the max amperage but not enough to do damage, Iām sure if it was used every day it would degrade the cells fast but if just using for once in a while applications like long range rides or Esk8 group rides Iām sure it would be just fine