I use the streamlight strion LED rechargable with car charger. It is one of the best lights I have ever used. It has a metal case though so if you use your mouth to hold the light (I do not) then this is probably not for you, also metal case flash lights probably not allowed if you are at a company with a big safety program. It is a nice compact light and puts out a really bright light. I can go a few days without charging depending the usage.

They are expensive but if you are going through the other lights like you say, it is worth a try.I have had mine for over 5 years without any problems. It has been dropped a couple floors and survived.