Sony ACC-CN4 Rechargeable Battery Kit for Sony U-Series Digital Cameras Rechargeable battery kit with 4 AAA Cybershot NiMH batteries and quick battery charger Compatible with Sony's DSC-U50 and other U-series digital cameras Powers camera for longer periods than standard alkaline AAA batteries Reduces the risk of "memory effect" for better long-term efficiency Power capacity of 800 mAh; charger measures 2.63 x 1.3 x 4.25 inches (W x H x D)