Hi Sean, Alarm guy is giving you ok advice but not resolving your problem. GTS has it spot on, So does Acorn The other idiots havent a clue ,
1st you cannot test a battery with a multimeter,
Us engineers in the industry use ACT IBT-GOLD testers, they simulate a 12 hour battery dis-chage in seconds.
They cost about £150 and are not openly available.
Just buy yourself a Yuasa 7amp rechargeable battery, average life, 3-5 years, If in a hot cupboard maybe 18-24 months ish.
Arfur you are a muppet, and obviously not from the industry.
Nick, November 2010