12V 120Ah 200Ah 300Ah LiFePO4 Lithium Battery Deep Cycle BMS for RV Marine Solar. 120Ah LifePO4 Battery. Model No.: TWLFP12120 12.8V 120Ah. 200Ah LifePO4 Battery Model No.: TWLFP12200 12.8V 200Ah. Precautions for using lifepo4 products for lithium iron phosphate batteries.