Originally Posted By: haertig
Then I remembered - hey, these things are highly regulated! I put in new batteries and all was good again. You really get NO WARNING when the batteries are about to die. Full brightness one second, then total darkness the next. If you're in a situation where you really need a flashlight, carry a small backup light (I always do, luckily).

I fly electric powered model helicopters. I talked to the maker of the speed regulator I use, and asked him why nobody makes a constant-RPM regulator for electric helicopters, like they do for gas ones. He said it was the same problem- you get NO warning when the battery is low. Which is bad on a helicopter! You need to be ready to land when the battery runs out.
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- Benton