My oldish Banner battery seems to hold at between 12.6v and 12.7v for weeks although I sometimes put it on a Ctek especially in this colder weather.
However I have removed the immobiliser and I always turn off the battery isolator switch if the car is left for more than a couple of days.
Possibly a stupid question to the more electrically minded amongst you but to check residual current draw do I simply disconnect the earth lead and run the multimeter between the lead and the battery negative terminal?
Bear in mind the standing voltage of a battery after an hour or so of use gives an indication only of the state of charge of the remaining capacity left in it. Towards end of practical life a high voltage reading may not indicate enough energy to start engine, with natural discharge having an ever increasing effect on voltage measured some time later.
Regarding measuring standing current draw make sure you initially use the 10 amp range available on most multi-meters to avoid damage. If current draw is too low to measure you can then try a more sensitive range.
