fiskesh
You want to be sure when you buy rechargeable batteries that the description says that they are low self discharge. There are some that aren't. If you use the non LSD in things like radio-controlled gizmos, where you charge the batteries and use them pretty quickly, you don't need LSD, but in a camera, they may be in the camera for awhile before the camera switches from external to internal so you don't want the internals to lose power quickly.