Features:

• New improved NiMh rechargeable battery technology
• Already charged and ready to use
• Stays 85% charged after 1 year of storage
• Recharge up to 1000 times
• Battery Capacity: 2000 mah

Editor Reviews:

Product Description:
SONY NH-AA-B4K CYCLEENERGY BATTERY BLISTER MULTIPACK (AA 4-PK) CYCLEENERGY BATTERIES; DO NOT REQUIRE INITIAL CHARGING; MAINTAINS 85% OF THEIR CHARGE AFTER 1 YEAR; RECHARGEABLE UP TO 1000 TIMES ; AA; 4-PK

Rating : - Keep their charge, last a long time
I've been using these batteries in my camera for over a year now and they are still as good as new. I also recently started using them in the Wii remotes and Wii fit balance board and the performance is amazing. It has been over 3 weeks and still no need to charge them.