Shows the remaining battery time and percentage in the menu bar. The app has a setting to hide the menu bar icon when the power plug is connected, which can be useful if you only care about the battery time/percentage when on battery.

Battery Guru displays battery usage information, measures battery capacity (mAh), show estimates, and helps you change your charging habits with useful tips to prolong battery life and increase its lifespan by 200%.

Battery Health is a professional battery monitoring utility for viewing vital statistics about your MacBook's and iOS device's battery, such as power level, heath, capacity, temperature, charge cycles and more.

Battery Guru displays battery usage information, measures battery capacity (mAh), show estimates, and helps you change your charging habits with useful tips to prolong battery life and increase its lifespan by 200%.
Batteries have a limited lifespan, every time you charge your device it wears out the battery, lowering it's total (design) capacity.
Now, you can reduce wear, spend less time with your device attached to its charger and get more out of your mobile life without constant concerns about the low battery level.