A lithium battery is used in the car key fob it transmits signals from the fob to the cars electronic receiver enabling the doors to open without inserting the key in the door lock, it also disables the alarm at the same time. It is also used in transmitting signal from remote controls to activate the alarm to open or disarms the security for garage doors gates or shutters.
Car key fob batteries
The first thing to do is to identify the battery you require, the information is often in the vehicle's
handbook, If you can't find it there, you will need to remove the cover from the fob to identify the battery be carefully
when doing this. CR927, CR1220, CR1216, CR1225, CR1616, CR1620, CR1632, CR2012, CR2016, CR2025, CR2032, CR2320,CR2325,
CR2450, CR1025, CR2430, CR2335, UK.
remote signal transmitters car key fobs are mostly powered by lithium batteries these days, older Vehicles with car alarms use 12 high voltage battery to transmit the signal to the vehicle these batteries can also be used for lighters and transmitting signals to security and garage remote doors.