Hi folks. I have a 200ah Lifepo4 battery with a 120a 4 cell BMS from overkill. I've have to battery and been using it regularly for about 2 years now and everything has been perfect until last night. During the night the battery made a long beep and then the power cut off, I'm assuming the battery was drained (a little confused on this too as I was sure there was plenty of juice left in there) anyway I tried to charge up the battery this morning but now the Bluetooth no longer seems to work, I cannot connect to the BMS via the app so I'm not sure how to see what's going on with the battery now. I connected the battery to my home charger and it's now showing as full but still no life from the Bluetooth. Any ideas? Thanks