By disconnecting the batt you lose the alarm code, i would have to setup the whole system, by having a second battery or keeping the main one charged, i would avoid going through that rigmarole, had new battery just before Xmas and had to reprogram the whole system.
Hi i am disabled and don't use my range rover p38 DSE very often, so usually flat when need it, so thinking of wiring second battery, with split charger and isolator switch, has anyone done this or have any ideas /suggestions, thanks