These 3.2V CATL 320ah Battery cells are produced by CATL, benefit from advanced equipment and strict quality testing standards. All batteries are equipped with a multi protection safety system and assure protection of safety and battery use. No leakage. SPECIFICATION: Max.Continuous discharge current Rate:1C. Max.Continuous charging current: 1C. Internal resistance <0.8mΩ. Nominal voltage: 3.2V. Working voltage range:2.5V~3.65V.Charging temperature range: 32 ° F~131 ° F/0 ° C~55 ° C. Discharge temperature range: - 4 ℉~140 ℉/- 30 ℃~60 ℃. 5 YEARS LIFE/11000+ CYCLES:All batteries are equipped with a multi protection safety system.Battery packs require a LiFePO4 BMS. these cells do not contain a LiFePO4 BMS. before using these cells, be sure to connect a suitable BMS before charging and discharging. GRADE A CELL: You can DIY your own battery pack with these battery cells. All cells are brand new A grade, these cells have the same internal resistance, voltage and capacity and they are balanced. WIDELY APPLICATIONS: Our cells can support multiple series or parallel connections,please choose the right cell to make the right battery pack according to your needs.Perfect for off-grid solar power systems, RV, marine, boat, energy storage, camping, fish finder, house alarm security, emergency lighting, UPS or used as backup power supply etc. Grade A LiFePO4 Cell 3.2V 320Ah Battery Lithium Iron Phosphate, Charge/Discharge Rate 1C/1C, Support Multiple Series or Parallel DIY Battery Packs