A maintenance-free, sealed lead-acid, standby and auxiliary power supply that provides long service life and dependability.The battery is for use only with charging circuits calibrated for lead-acid batteries. It is suitable for supplying backup power for fire, security, and access control systems during AC power failures.The D126 fits in any of the currently offered enclosures and connects to the two color-coded battery leads supplied with the control panel or module. Use a D122 Dual Battery Harness to connect two D126 batteries in parallel and double the amp hour output.