do it all the time mate, bell the car, everything works as it should, open the bonnet, kill the battery, close the bonnet
the mrs is getting pissed off about opening the bonnet all the time so i'm moving it indoors, open the car, switch the kill, alarm off, off i go
both the ford alarm and the cat one are armed as soon as the battery gets reconnected so it's all safe on that side of things and the only issue is with the radio, but i don't really listen to it as it's all tv stuff and dvd,s and cd,s and usb and ipod and stuff
might not need to know as i might be using the car more often