Hi just got my lad a oset 16 fully charged it up all 3 lights on the throttle grip after a bit he stop I noticed it went on to 2 red lights and lost power fast but never went down to 1 red light is this right thanks 

Is it a new or used bike, when fully charged check the voltage of each battery separately, a good battery will show about 12.8v and a dead one 12v, sounds strange, but if one is dodgy that would be my first thing to check. 

It’s a older bike but it’s had 3 new battery it’s just funny how it doesn’t go to 1 red light it goes to 2 red lights then it needs charging again thanks 

I wouldn’t be over concerned about the lights, just a guide having had a few  Main thing is how long does it last before power tails off, depending on type of riding, hills and flat out riding take their toll