Originally Posted by cc700

I have two p7s and each of them will only run at full power for a handful of seconds before dropping down to a very low(100-150 lumens) output. i don't think it's the batteries, i think it's the heat and driver. i can't figure it out, i'm not a technical person.

this annoys the hell out of me because they were each about thirty dollars and neither is any good for seeing anything on a bike.