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Should probably add, at point 1 the battery was not connected to anything. Based on previous comments I'd guess the BMS has gone into some kind of standby mode and would be expected to return to 13.4 when a load is applied. Instead the voltage drops further with the load. Point 2 was me trying...

Im starting to think the BMS in this battery is junk. With a load applied the voltage is going down even more, it was sat quite happy at 13.48 last night. I’ve got it on charge with the Victron at 14.2v but no current is flowing, is the battery full but bms showing lower voltage for some reason?

Thanks. I have just bought the IP65 10amp version, should be good for my current 50Ah battery and if I ever change to a 100Ah battery it won't be too slow! I'll let you know how I get on. So the aim is to be able to charge up to around 14.4v (3.6v x 4) ?

Many thanks for your reply. I will review purchasing a Victron IP65 charger and see if that does a better job of charging. In regards to the BMS going into standby, when I apply a load, 95% of the time the voltage drops even further (see below) and then returns to 12.8, and then randomly pops...

Hello people, I current have a Renogy 12v 50Ah lithium battery that I dont think is working correctly. The battery is kept in the back of my van to run 12v accessories (water pump and led lights) and I charge the battery in my home using mains chargers (either Noco Genius 5 or an Optimate...