The battery has always been one of the weak points of all mobile devices, especially after the arrival of smartphones and those giant screens. As they pass the charge cycles, the battery of your device will get worse until the moment in which we are forced to change the battery, change that although more expensive, it is always advisable to perform it in official company stores, if we do not want to install us any battery whose duration and performance may not be compatible at 100% with our device.
But before coming to replace the battery, we can try to calibrate the battery of your iPhone to improve the functioning of our device. But if once we have done all the checks we see that the battery is still giving us problems, we can choose to use the application Battery Percentage, available on the App Store completely free offers of ads within the application, ads that are quite annoying. Through the jailbreak can be found several tweaks that allow us to get the number of load cycles in addition to extra information on our battery, but so far no could do it directly from the App Store.
But Battery Percentage not only offers information on the status of our battery and if you need to change it, but it also offers us information about our iPhone related to CPU, GPU, memory, storage and the traffic of your internet connection. But it also allows us to perform various test to verify that your iPhone is working correctly. Between the different test can find one that allows us to check if we have any pixel on the screen, the operation of camera, speaker, microphone, headphone and volume button.
Tran Manh Quan 
