lithium iron battery module. 1:B4850 (2.4kWh) can connect in perreal up to 40 units. 2:Compatible with Shneider, SMA, Goodwe, Growatt, Deye, vlotronic, Solis, Lux power, Must and most inverter brand in the market. 3: DOD 85% ,6000cycle, 5 year warranty. 4: Smart BMS (battery management system) for battery comminucation.