The Highway Advisory Radio battery backup system is designed to provide emergency power to the HAR for approximately 72 hours in the event of AC power loss.
The Flashing Beacons systems that utilize solar power have a battery system that provides 12 volts of power constantly to the equipment.
This replacement battery meets the requirement of both applications and the specifications are:
Maintenance-free, deep-cycle, absorbed glass-mat battery (AGM) type no. 8A4D, 12 volt, 198 amp/hour. Size 20 3/4" x 8 1/2" x 10". Weight is 129 lbs.