Lithium-iron-phosphate (LiFePO4) is the safest lithium ion battery types. CNBOU's BL series 12.8V LiFePO4 battery. Composed of A-grade battery cells, four 3.2V 100Ah in series to 12.8V, charging and discharging support 1C, built-in 100A BMS management system, support Bluetooth connection to mobile phone APP for battery monitoring. Support 4 batteries for parallel connection, can reach 12.8V 400Ah, also can 4 batteries in series to form 51.2V 100Ah. Ideal for use in RV, yacht and off grid solar power system. Greater than 4000 cycles, DOD>80%. Long service life up to 10 years, can effectively save your battery cost.