Battery query

[MR E]

Wondered if anyone has had a similar problem to me.

I have a 37v Battery on my wife's Alien bike and the battery will not charge.
The charger indicates green led as soon as it is plugged into the battery .

I have tested both the external and internal battery fuses and they are ok.
I have tested the voltages on the battery at charger input and the output and can see the voltage on both.

I have tried the charger on another battery and it charges ok-- LED goes red and the battery voltages increases gradually.

It all points to the battery but initial tests look ok.

I am not sure if there are any BMS components in the battery itself.

This was a replacement battery from Alien and they say that the battery and charger was ok when it left them , and if I used the charger on another battery to prove the fault , I have invalidated the warranty , as batteries and chargers are only to be used on same type , but I tried to charge the battery straight away , so I know there was a fault before I used it.
The fault on the old battery seemed to be on the key switch as there was
little or no voltage on the output pins.

 

[flecc]

It sounds like the battery is at fault David. If the charger connection to the battery has only the usual two or three pins, there will be a BMS in the battery. The battery can show full voltage when not in use but drop to zero when placed under load.
.

 

[MR E]

Thanks Tony, thought as much.