Duracell recharbles awesome
I have been using a variety of batteries to keep my GPS gps'n and my lights shinin' with mixed results. I don't know if anyone else can verify my experience, but, all AA's are not the same. Regular Panasonic AA's will not stay in contact with my Garmin Etrex CS, so, every time you hit a bump, you risk shutting the unit down. The same is true of some Empire rechargeables.
I have found that the only reliable batteries (that seem to fit) are those made by Duracell.
To make a long story short, Duracell has introduced a new line of rechargeables and a slick 15-minute charger to go with them.
I picked up the charger and a couple sets of AA batteries. Now I am in battery heaven. These batteries fit snugly into my Garmin, and (as did all other batteries) work fine with all my head and tail lights, and what a pleasure to stick four AA's into a charger and have them fully charged in just fifteen minutes.
If you use AA's you should check into these. I think they are awesome.