First problem after 1800 miles! - Is my BMS Board Dying..?

Hey all,

I have a 48v / 11.6ah Hailong battery running a 1000w rear hub motor on a Cannondale conversion. On my last couple of excursions my power cut off as soon as the battery dropped to around 48v (sits on 54.4v after a full charge). This happened on 2 occasions. This morning I powered the bike up, the LCD lit up and then immediately died

I took the battery off the bike cradle (charger says fully charged) and tested the voltage from the power out points of the battery and my circuit tester says it is only pushing out 1.4v..? So I took the casing off and hooked up a test from the actual inner battery and zoom, voltage full off the scales.

Does this mean the BMS is dead, or is 1.4v just needed to run the LCD??

Yours,

Matt.

If you have it opened up, is it easy to disconnect the balance wire harness and walk a voltmeter up the "ladder"? If all the cells are balanced at 4.1-4.2V , then it's likely to be the BMS.

On the other hand, maybe you have a weak cell group.