sorry for the Hijack @achjimmy
@Dobbie get a proper battery gauge fitted - like this from Redarc
easy to see
easy to read
tells you instantly what you want to know
also, think about a small solar panel plugged in while car is not in use, just to keep the Battery up to date - immobilizers and such still use battery power while car is just sitting there
http://www.dx.com/p/solor-power-panel-auto-car-battery-charger-71635#.V5X146Klwjo
again, sorry for the hijack @achjimmy
@Dobbie get a proper battery gauge fitted - like this from Redarc
easy to see
easy to read
tells you instantly what you want to know
also, think about a small solar panel plugged in while car is not in use, just to keep the Battery up to date - immobilizers and such still use battery power while car is just sitting there
http://www.dx.com/p/solor-power-panel-auto-car-battery-charger-71635#.V5X146Klwjo
again, sorry for the hijack @achjimmy