These boxes contain LVTOPSUN lithium-ion batteries.The batteries are designed for solar inverter systems, with specific models like the 2.5kWh 24V or 5kWh 24V 200Ah versions listed.They feature a Lithium Iron Phosphate (LiFePO4) composition, often rated for 6000 cycle times.These units are certified for transport under UN3480 for lithium-ion batteries