My sister and her partner both own Ninebot One S2s and both have unfortunately been left for most of this year with very little charge in and haven’t been used. Now they have want to ride them - but only one is charging properly! The issue seems to be that one of the two batteries has packed up altogether, or is not accepting the charge for some reason. They’ve had both batteries out of the machine, tried disconnecting and reconnecting, charging each independently, nothing appears to work. Weirdly, the Ninebot app is registering the battery status as ‘normal’ even though battery one is failing to charge. Does anyone here have any advice? What’s the best option is one battery is a total goner?