WattCycle 12V 314Ah Mini LiFePO4 Battery

The BMS in these batteries is not fit for purpose. It isn't capable of balancing the four internal high capacity cells- that results in the BMS shutting off charging prematurely and prevents the battery from completely charging. When the BMs shuts down charging, it also switches off the "Charge" and "Discharge" from the internal battery cells to the battery case terminals. That effectively leaves the load with no power (or powered by whatever source is charging the battery), until the battery terminal voltage drops to 0.6V lower than the internal lithium cell pack voltage. WattCycle denied there was any issue when I reported this issue. I quickly worked out the warranty was useless. Since then, this BMS issue has been widely publicised over the internet- see Will Prowse on Youtube for some info. WattCycle have changed their app's behaviour to try and fix the problem, but it doesn't seem to have been successful. The problem lies in the hardware of the BMS- they can't change the low balancing current capabilities of the BMS using software. It's a hardware problem, requiring a better BMS. They were actively disabling warnings in the app last year- to try and hide the problem from users. I gave up and fitted a different brand BMS with 2 Amp active balancing current and first charge my battery reached 14.40V with no problems. With the WattCycle BMS I couldn't charge past 14.20V without the cell balance problem shutting down charging (to prevent one cell from damage due to overcharging.) The WattCycle BMS is limited to 50mA (plus or minus 20mA) passive balancing current.