I use rechargeable batteries in my Garmin Oregon. Until the start of the year I used the standard Energizer rechargeable batteries and found that whenever I wanted to use it, the batteries were flat. The charge would only last a few weeks at most. When I was in the supermarket, I spotted a new version of the Energizer rechargeable batteries and thought I would give them a try. What a difference technology makes! These batteries are awesome compared to the other Energizer rechargeable batteries. I charged them up and after about six months of very occasional use, they were still showing as fully charged on my Garmin. Well worth the upgrade.

It should be noted that rechargeable and normal batteries can not always be used interchangeably. The voltage of a standard non-rechargeable AA battery is 1.5V whereas a rechargeable will be slightly lower (1.2V for the Energizer Power Plus Rechargeable batteries). If your equipment is expecting 3V from it's two AA batteries, two rechargeables aren't going to work. They also discharge differently compared to non-rechareables, which may cause false readings with battery indicators. Most good quality equipment should be able to handle it, but it is worth checking out before you buy if you want to use them.