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I use the lithium ion rechargeable batteries for my camera and my flashlight, they hold their charge for extended periods of time,and have a bigger charge then the non rechargeable alkaline ones.
All of the other rechargeables have let me down either due to not being able to hold a charge/die early or lose their charge fast after charging/using. Try using Li-Ion lithium batteries, they really perform.


Lithium Ion (Li-Ion) Batteries

This is the current and most popular technology for batteries. The only real drawback of Lithium Ion batteries is that they are expensive.
Lithium Ion batteries have a longer life then NiMH batteries.

Lithium Polymer (Li-Poly) Batteries

Li-Poly are the newest and most advanced technology for batteries. Ultra-lightweight, they do not suffer from memory effect and will deliver up to 40% more battery capacity than a Nickel Metal Hybrid (NiMH) of the same size, However they are still quite rare.