How to get real time battery level on iOS with a 1% granularity

There are at least four different ways to read the battery level, and all four ways may return different values.

Here is a chart of these values through time.

The values were recorded with this iOS project: https://github.com/nst/BatteryChart

Please check out the code for reference.

UIDevice *myDevice = [UIDevice currentDevice];    
[myDevice setBatteryMonitoringEnabled:YES];

double batLeft = (float)[myDevice batteryLevel] * 100;
NSLog(@"%.f", batLeft);    

NSString * levelLabel = [NSString stringWithFormat:@"%.f%%", batLeft];    
lblLevel.text = levelLabel;

check out this site : Reading the battery level programmatically

but, carefully use. all of the APIs used here are undocumented on the iPhone, and will probably lead to a rejection if you submit this application to the App Store. Although battery charge status is not exactly, I'd recommend using the UIDevice battery monitoring methods.