Voltage seems to bounce all over the place and then shuts down. Reseating the battery sometime resets it, otherwise it randomly starts working again after a bit before this happens again.

 

With an almost fully charged battery. Tested the battery immedately after and it reads 55.01V.

 

https://photos.app.goo.gl/A0IjdXyPpvzWVsMT2

Could be a few things including poor connection or a weak cell string (or more)

 

The bbshd is a hungry bit of kit.

 

What are the battery specs please ?

52v, 14s battery using MJ1 cells.

I'll have to look up the cells

 

But a reading hot of charger should be 58.8v for a 14s battery (14 x 4.2v)

That was a decent 5m ride off the charger.

That was a decent 5m ride off the charger.

 

Fair play , id look at a duff connection being a good possibility then. If start with battery connection ( internal and external on both sides of battery and connector,)

 

Look for a break where the solder is soldered, I've seen a good few breaks here with physical connection which moves apart through vibration giving these symptoms (on other kits though to be fair)

 

Also personally had a few internal welds go on cell pack itself. Similarly with contact held but weaker or broken intermittently through vibration. Same symptoms

 

If it's software I'm notb any use to you !