Apple Original LI-ION BATTERY, 1) Double Protection 2) Quality Check Pass 3) 24hrs backup* New high-quality Li-Ion battery Stay connected with your family and friends by getting extra battery power today. Best replacement for the original battery with comparable standby and talk time. The battery operation time depends on conditions such as 1. Complete mAh inside the Battery for Excellent Back for Mobile Phone after the heavy usage.. 2. Completely Tested Phone All purposes for long life. 3. It is a replacement battery with complete mAh compatible with its respective brand. We ask you to use an original company charger to charge your mobile and our battery any other than the original charger can affect your battery and mobile drastically. Check if there is any dust in the connector or if any pin is broken or not. Also, check for any corrosion in contact and plug. Clean the plug using IPA or swabs. Make sure you use ESA safe ----- only check the interface connector to see if there is any dust or not. If there is any dust then clean or replace the interface connector as required. If the problem is not solved then update the software/operating system (os) to the latest version THE BATTERY INSTRUCTIONS: Please drain all the power of the battery for the first 5 times before charging, and then take a full charge. Thus the battery can be reached the optimum effect of using. Please note that its full effect and longevity are only achieved after 3 to 5 complete charge and discharge circles because Li-on Battery becomes stable after few uses.