This Tridonic battery pack is designed specifically for emergency lighting units. This battery has 3 NiMH cells (Nickel-Metal Hydride) and is free from Cadmium and other toxic mentals. This product has a one year warranty from delivery and is designed for usage for 4 years. Given the emergency application this product is designed to function effectively in high temperatures and maintain charge. Made by a certified quality manufacturer this product has a sturdy polycarbonate with a 1.0mm2 stranded wire. The ambient temperature range for this product is between 5 and 35 degrees Celsius.