Just got a new 36v Oset . I've been charging the batteries as directed in the owners manual but the battery life seems poor . The life just drops off the edge of a cliff after about 30 mins of general "section" riding in the local flat woodland . Strictly no wide open throttle MX riding . The battery indicators wouldn't go past the 2nd light as the performance dropped off but the bike was crawling at about 3mph . Even when the bike ground to a halt and stopped it showed 2 lights on the throttle . Our old 24v went 3-2-1 empty . Even our new 12.5 out performed the 36v by dong 2 rides on 1 charge as opposed to the 36v 1ride - 1 charge .

Any clues or theories would be helpfull . Not going LiPo tho !

Sounds like you have a duff cell. Have you tested all of them?

I'm going to take the batteries to my local bike shop and get a " drop test " done on them , see if that shows anything up . Checked the wiring as best as I can and all seems fine . Charged it for 12hrs again and it lasted about 30 mins again . Same end result !! Batteries sat at 12.36v after bike has ground to a halt . The little 12.5 lasted for 2hrs on one charge going over the same terrain as the 36v, time and time again . What I did notice tonight was when the 36v charger was working the internal fan was working hard . Whereas the fan wasn't going round on the 24v charger . Looks like a call to Oset uk .

We have a 36V and a 48V bike here and both will run +/- 1hr with an experienced rider using it on the standard batteries. 2.5hrs-3hrs with lipo's on both bikes. I would definitely say there is something wrong with yours somewhere. Oset are incredibly helpful, do give them a ring.

I've got a 24 & a 36v and they both last for well over an hour when used for trials riding. The performance dropped of fairly quickly once they start to fade, but you do get some warning. It certainly isn't like a "cliff."