it's a hassle to stop & check your rear lights for sure. I do it tho. stop lights are a good time to do it. I dislike stopping tho. I use two, so redundancy helps. this fall, on my nite rides, I've been using them on steady, not strobe. been curious about battery life but didn't want to remove & test them. decided to ride them until 1 fails, then replace the batts in both. finally happened last week to one of them, so I have to re-batt them both after Thanksgiving