Take it run, if you don't like the laser, sell it (the laser grips, not the gun) and replace the grips with whatever you want.
Battery life depends on use. If you're right handed, holster fit shouldn't be an issue.
There's very little extra bulk, it's about the same size as other rubberish grips.
The accuracy depends on you. If your trigger control is good, and you know how to shoot a snub, you'll be fine. If you've never shot a snub before, don't even turn the laser on at the range and learn how to run the gun.