I don't notice it as much with AAA batteries in the taillight but I do notice they don't have the same battery life. When it comes to the NiMH batteries I really notice it. I'm not sure if lithium batteries hold up better or not. I had it happen to m twice last winter with the NiMH battery. I had originally used it, with the shock to it, ad got around 2 hours of run time off the battery. After I charged it up and took it immediately into the cold environment it lasted 5 minutes and was dead. I recharged it and had the same thing happen again. Since then I've had no trouble. Then again, since then I make sure to always take it into the temperature I'm going to be using it 10-15 minutes before I ever go to use it. I let it get acclimated before I use it and it still runs 1.5-2 hours easily on a recharge. Like I said the AAA don't drop dead fast but the shock does shorten the battery life. Even in something as simple as a flashing taillight. Two years ago I would go through taillight batteries once a month or quicker. Now I go through them, maybe once a winter. I keep the light mounted on the bike versus keeping it in the pack that I take inside with me. The bike always stays outside. YMMV, but I thought I would mention it as a precautionary measure.