my lcp came with a lasermax. it was new from the factory batteries ran out inside of 3 weeks. i havent bothered replacing them as the laser came with the gun and it breaks up the outline in the pocket.
i didnt leave it on or anything just occasional usage as a cat teaser.
i dont think it was ever turned on in the holster as it was never on when i removed it from my pocket holster. it seemed to hold zero under recoil but i found it less than useful for its intended use. it makes a great bit of camoflage but i wouldnt spend money to buy one to put on a gun.
i found it next to useless in daylight or indoor lighting.