Panasonic eneloop pro BK-3HCDE/4BE is a four-pack of rechargeable AA batteries for everyday devices that draw more power, such as camera flash units, wireless keyboards and mice, game controllers and radio-controlled toys.
Each nickel-metal-hydride battery is rated at 1.2 V and 2500 mAh. The AA format makes these cells suitable for devices designed for that battery size.
The datasheet specifies up to 500 life cycles and states that the batteries retain 85% capacity after one year of storage. The pack contains four batteries.