the car didnt come with an alarm so i cant gauge it,but i had a sigma cat 1 on my s2 and that would last weeks and it would still start,the alarm usually goes off in the middle of the night when im in bed so i havent been out to check the flashes.and if im near it its usually disarmed,i went to a posh restaurant 1 night,got a window seat so i could keep an eye on the car,i seen the indicators flashing a few times as it went off!bit embarassing!