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Q: Would this work to charge a 12v 100ah lifepo4 and if so how long would it take?
Our charger is designed to charge LiFePO4 batteries, and it would take around 100Ah/10A=10hrs to fully charge the battery.
Q: Why is it only charging my amptime 50AH battery to 12.2 volts?
The battery voltage should be 13.5V and above when the battery is fully charged, and the voltage should be tested after disconnect from the charge for over 15mins. If you use the 10A charger to charge the 12V 50Ah battery, it could be fully charged around 50Ah/10A=5hrs. You could check to see if the battery is fully charged.
Q: Will this reset the bms voltage turn off of your 300ah battery?
Our 12V 300Ah battery built-in 200A BMS, it could supports max. 2560W load power and max. 200A continuous charge/discharge current, and the BMS have low voltage cut-off protection, it low voltage disconnect voltage at 10.8V.