... work at 70°C Characteristic:1. Green: Non-Toxic, comfort to RoHS.2. Long cycle life: > 2000 cycles, while Sealed Lead ... and it can fully discharge6. Good thermal stability: - 20°C to 60°C7. Back fast charge, good consistence, no memory effect ... produce lifepo4 battery cells but also solar contoller,any questions,pls contact with us. Solar system lithium battery pack 12v 40ah with solar controller