Power usually goes out when you need it the most. Therefore, it's always advisable to have a spare battery on hand. The rechargeable battery D-LI90 provides 1,860 mAh at 7.2 V and 14 Wh, which is sufficient for about 1,000 shots with the K-7. PENTAX batteries are specifically designed to meet the requirements of the cameras to ensure flawless operation. Compatible with PENTAX DSLR camera models K-1 II, K-3, K-5, K-5II, K-5IIs, K-7, and 645D. For more information, please refer to your camera's user manual.