Show detailed information about current battery

My G2 Android used to last an entire day without charge for the past year. Now it appears that it gets to very low energy at about halfway through the day. Is there something like coconutBattery (Mac) for the Android? > With coconutBattery you are always aware of your current battery health. It shows you live information about the battery in your Mac, iPhone and iPad. I am essentially looking for original Design Capacity (ie. 6900 mAh) and now the Current capacity (6559 mAh).