Most of the power goes out when you need it the least. Therefore, it is always recommended to have a spare battery with you. The rechargeable D-LI90 battery delivers 1,860 mAh at 7.2 V and 14 Wh (enough for about 1,000 shots with the K-7). PENTAX batteries are specially designed for the requirements of the cameras. Only then can a perfect function be guaranteed. Compatible with the PENTAX DSLR camera models K-3, K-5, K-5II, K-5IIs, K-7 and 645D. For further information please refer to the operating instructions of your camera.