【Built-in BMS Protection】Our 12V 300Ah LiFePO4 batteries are equipped with a built-in 200A BMS that protects against the most common failure issues of LiFePO4 batteries, such as high temperature, over-voltage, overload, overcharge, over-discharge, overcurrent, and short circuit, ensuring safe operation. Our batteries adopt advanced battery technology, and the cells inside are UL-tested and certified for high safety. 【Max. 40.96kW Capacity Expansion & 61.44kWh Output Energy】The DATOUBOSS 12V 300Ah LiFePO4 battery supports both series and parallel connection to achieve greater capacity. It can be expanded up to 4P4S to form a 48V (51.2V) 1200Ah Li-ion battery pack, delivering a maximum of 61.44kWh energy (4P4S). Flexible combinations can be made according to needs to meet different voltage and capacity requirements, making it perfect for home solar battery systems, off-grid systems, RVs, and home backup power. 【Higher Performance and Safety】The 12V 300Ah lithium battery is made of automotive-grade lithium iron phosphate cells with IP65 waterproof rating, higher energy density, more stable performance, and greater power—ensuring superior quality. The cells are UL-tested and certified for maximum safety. 【1/3 Lighter Weight & 1/2 Smaller Size】The 300Ah LiFePO4 weighs only 27.7kg, which is just 1/3 the weight of a comparable lead-acid battery with the same capacity. It saves space, is easy to move and install, making it the perfect replacement for lead-acid batteries. Suitable for RVs, boats, homes, or off-grid solar systems, it provides a more convenient and user-friendly experience for various applications. 【Wide Application】Weighing 27.7kg/68lbs, the LiFePO4 300Ah battery can be safely used in many fields, making it an ideal choice for backup power, home energy storage systems, lighting, trolling motors, fish finders, lawnmowers, golf carts, boats, solar systems, UPS backup, RVs, caravans, and more! DATOUBOSS 12V 300Ah Lithium LiFePO4 Battery, MAX 3840Wh Energy, Built-in 200A BMS, 15000+ Deep Cycle Battery Trolling Motor, RV, Camper, Marine, Solar and Off-Grid System