This lithium-ion battery pack has a capacity of 1800mAh, so it is possible to shoot up to 850 shots at normal temperatures on a single battery charge. The battery is also more compact and lighter in weight than previous battery models. The battery communicates with the camera, so that you can always check the remaining capacity on the camera's power source info screen. In addition, a unique feature of this battery pack is that it has a microchip encoded with an 8-character serial number. So when the battery pack is installed in the camera, you can register it using a menu command and then track the condition and power characteristics of up to 6 batteries in your camera to ensure you use your batteries evenly and identify batteries that are near the end of their useful lifespan.