Here's how you can see the correct battery percentage in iOS

Current Battery

  iOS has a special algorithm to calculate the battery percentage of our iPhones, iPads and iPod Touches, but it is far from 100% correct. You have probably encountered situations in which your terminals closed suddenly with a small percentage of energy available, but upon reopening the terminal will display completely different data.

  To solve this type of problems and display the battery percentage much more accurately was launched in Cydia tweak your Current Battery. The tweak has two modes of operation, the first displaying the available capacity using its own calculation algorithms, the second displaying the available energy based on Apple's algorithms.

Show actual battery percentage in percentage by remaining mah and available capacity. A respring may be needed for the percentage change to take effect. When mode 2 is being used, a full charge may not bring the percentage to 100% due to the battery wearing off over time.

Provides two battery modes:

 

  1. Actual remaining / Actual Capacity
  2. Actual remaining / Designed Capacity

  Regardless of the working mode chosen, we can display the remaining available energy including in mAh, although this probably won't help you that much. Current Battery is available for download from the repo ModMyi of Cydia.