The USAlert NiMH Rechargeable Batteries are the primary power source for both the WatchDog and WatchDog LT Voice Pagers. Three individual “AAA” sized NiMH (Nickel Metal Hydride) rechargeable batteries, rated at 1100 mA/hr, come standard with the WatchDog pagers. The NiMH battery type is designed to be used in small electronic devices that are used frequently and require a strong energy source. Replacement battery pricing is for a pack of three "AAA" cells.
Battery life may be reduced after 12-18 months of use as any rechargeable battery won’t last forever. To maintain optimum pager performance, replace batteries at regular intervals with new ones having the same 1100 mA/hr capacity. Inferior or lower capacity batteries have been found to create a number of performance issues. Normal charging should take approximately 2 hours and you can charge a spare set of batteries in the charger while also charging the pager.