Ansmann 2850 mah AA NimH rechargeable battery. 

• Strongest and longest rechargeable batteries on the planet.
• Great for wireless mics, digital cameras and more.
• Engineered for long run-time and high recycles.
• Why use alkaline batteries when you can get up to 1000 recycles with this high capacity rechargeable battery? 
• Cost a little more than consumer grade, but yields up to 1000 recycles instead of a 100
• 2-year warranty.

** This is Ansmann's new version of the 2850 which is slightly wider in diameter (.15 mm) If you have a dimension-sensitive device, we  recommend using the Ansmann Slimiline 2850 mah AA    or Ansmann Max E Pro