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If the battery has gone completely flat there is a way of "jump starting" the charge. It is not without risk but has worked for me on drill and phone batteries that would not charge.
This is to connect positive to positive and negative to negative from another similar battery voltage something like an 18650 battery or if you have a 6 volt battery charger use this.
You should make momentary contact only.
Try this absolutely at your own risk.
http://singletrackworld.com/forum/topic/re-awakening-a-dead-li-on-battery
@Mr_Sworld @Thuekr
I've tried all the different button combinations, tried charging it up overnight, taken the back off, unplugged the battery and plugged it back in again all to no avail.
I've read that the batteries in phones and tablets don't like being drained completely so won't charge up again once they've gone completely flat, so I guess this might be it and it might just need a new one.