The Battery Backup is reef tank insurance in an aluminum housing. The Battery Backup**, helps keep flow going during power interruptions, protecting your valuable investment -and your tank inhabitants. *Backup lifespanwill vary depending on battery life, pump mode and other factors. ** The Vectra requires a Battery Backup Booster for use with a Battery Backup. Product Features Backup power for 30 or more hours on a VorTech Pump. Can connect to another Battery Backup for two times the run time. Comes with trickle charger so youre always prepared. Complete package comes with all the wiring cables needed. Specifications 18 Amp-Hour 12-volt sealed battery. Powder-coated white aluminum housing. Dimensions (L x W x H): 9 x 7 x 3.25 (228mm x 177mm x 82.5mm)