Need a replacement battery for your emergency lights? Check out the Dantona CUSTOM-70 Rechargeable Replacement Battery! This replacement 7.2 -volt, 1, 800 mAh Nickel Metal Hydride (NiMH) battery is used in the Ademco Lynx Back Up Emergency Lighting and meets or exceeds original manufacturer specifications.. 7.2 volts, 1, 800 mAh. Long-lasting. Rechargeable