I put nothing but Sanyo Eneloops into my Nikon SB-600. These batteries have low-discharge rate and the batteries last a long time. I also use these batteries for my LED flashlights, keyboard/mouse and other products. Amazon offers its Amazon Prime members the Eneloop 1500 Ni-MH Pre-Charged Rechargeable AA Battery 8-Pack, model no. SEC-HR3U8BPN, for $19.25 with free shipping. (Non-members can spend over $25 to qualify for free shipping; otherwise, shipping adds $5.58.) These 2,000 mAH AA batteries are precharged and can be recharged up to 1,500 times.
UPDATE: Price is now $19.10.
