Sealed lead acid batteries are designed for powering appliances, alarms, exit signs, emergency lights, and similar applications. Their construction allows them to be mounted in any position, and are safe from exterior harm and impact. These batteries are rechargeable, and can operate up to 20 hours or longer depending on use before recharging.
Lightbulb Wholesaler's model LBW1250 exit / emergency battery operates off 12V and is sold in multiples of 1. It comes with a standard manufacturer's warranty, and its UPC is 372036360060.