The D1218 is a 12 V 18 Ah sealed lead-acid battery that provides maintenance-free, standby and auxiliary power. The battery offers 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.Not all control panel enclosure configurations can accommodate the D1218. The D1218 has two boltfastened terminals. It connects to a compatible control panel using a D122 or D122L Dual battery harness.