These batteries are common in emergency lighting systems but also for fire alarms, burglar alarms, power tools, and even golf buggies.

You identify the battery you need from the number on the existing battery if it is a replacement.

Alternatively, by the voltage and amp hours if it is not a replacement

Most equipment will specify both of these figures. The voltage is self-explanatory and cannot be varied; you cannot mix voltages this should be considered as the "speed the power comes out"

You can change the amp hours if you wish, as this is the amount of power the battery holds in store, the problem is normally one of size and this limits your options.

We normally recommend you stick to the manufacturers specification unless you have a particular need.

Other brand names for similar batteries that are interchangeable are Hitachi, Fulman, Fiamm, Alcad, chloride and SEC.