Hello,

These batteries are LiFePO4. Made by Ogrphy. All 3 were purchased as a matched set. They've only been in the cart for 1 or 2 days.

As said in post #10 the batteries are lithium type.

Bertus

 

Okay, I searched for lit.

I would load test each battery separately with a 12V automotive bulb at this point.

 

Hello,

Here i found info on the used charger:
https://no.co/genpro10x3

Bertus

 

Like ALL the other crap in the world these Ogrphy are made in Shenzhen, so dont do your brains looking for a solution, take them back to where you bought them and get some batteries that work

Ive got a friend that has a brand new Shenzhen made electric motorbike, it has these batteries fitted, its been more time back to the shop with battery problems than it has on the road in the last year

 

There has been a similar condition causing a similar but different issue with NICAD battery packs, where one cell would "go dead" and then be charged in reverse by the current from the non-failed cells. In this case it was just the reversed voltage produced by the other two batteries still functioning. The external load completed the circuit, for those trying to understand what happened. So it was not an open circuit mystery, it was a hidden circuit issue.

 

the best way to test the batteries, to remove them and test them under a 12 volt load of some sort. An old automotive bulb, even a turn signal (35W) should be enough to determine if a battery that reads a good voltage may in fact be dead.

I would load test each battery separately with a 12V automotive bulb at this point.