for the future!! next time(not helping you at the moment though!!)before the battery is disconected clip your battery charger to your battery terminal cable then as you remove the battery you still have a feed to your alarm etc(clip to earth on body) the alarm only needs a small amount of current to keep it alive!! as the other guy says put it in mode-. as it happens you have a small power pack that keeps your alarm going in the event of battery disconection!!!!!!!!!!!-the alarm is actually doing its job and waiting for you to tell it what to do!!!!!!!