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Atilla
and dont lick your fingers afterwards4) Alarm control panel batteries.
Alarm control panel batteries should last up to 5 years. 6-8 really
The best make of battery is the yuasa brand, these will last 5 years maximum. rubbish they can last years
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Other brands may cost less but only last 2-4 years ditto
If you check the voltage of your battery it should be 12.5 - 13.5 volts and if its less than 13.2 its dead
If your battery is warm / hot to the touch (sometimes splits in the side) it needs changing
get it right first B.