The Century PS range is perfect for use as a long draw power source in stationary applications. Used primarily as back-up batteries in communication and alarms systems, they can be also used as the main power source in non-cranking capacities. This unit is virtually spill proof meaning you can mount it on whatever angle you need, and the maintenance free design means you don't ever have to worry about topping it up. Available in a range of sizes, voltages and amperages, there's a Century PS battery for almost any situation. The Century PS640 is a 6 volt 4 amp hour battery commonly used as a back-up in emergency exit sign lights, so you can make sure you're protected next time the power is out with this unit Battery a little on the flat side? Get the power flowing again with our battery charger range.