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not necessarily, could be the internal sensors (if you have them of course) reacting to temperature changes etc. I have a cobra system and during the cold spells, disable the internal sensors and no more hassle, battery was never low either.
If your car will start after the alarm going off, its not the battery.
I had that happen years ago on my Cossie. seems as the battery wasn't holding its charge, the alarm was sensing a voltage drop, similar to the courtesy light coming on when door is opened. Get your battery checked, its free at many places. If that don't fix it, look elsewhere.
Is it also true the sidelights/lights go off when you leave the car on these models so the battery won't discharge. Found it a bit strange there is no warning sound or display on the dash to show lights are on or left on when exiting the car?
mine did the same got to the point were I fitted a new battery was ok for a few months but come back now and again - keep meaning to take it to the garage to check which sensor is setting it off but never get the time always more important things to tinker with.