BatteryInfo Lite is an application that allows you to view stats about your device’s battery including; temperature, current capacity, max capacity, design capacity, charge percentage, cycle count, voltage, boot voltage, serial number and model. It’s a simple little app, nothing too fancy, just a list of the battery stats. But, if that is all you are looking for, you’re good to go with this one! You can get BatteryInfo Lite via the BigBoss source.
Note: This application claims to have a charge percentage accuracy of 0.07% that is compared to the UIDevice’s accuracy of 5%.