... Lead Acid (SLA) battery and NIMH battery. With 1/3 weight, smaller dimension, but 8 times cyclelife ... 60°C, can safe work at 70°C Characteristic:1. Green: Non-Toxic, comfort to RoHS.2. ... weight is lightest when compare with other battery. 1/3 weight of SLA, 65% weight of NIMH ... but also solar contoller,any questions,pls contact with us. Solar system lithium battery pack 12v 40ah with solar controller