Have you ever encountered such problems? Like charge frequently, power off suddenly, run out shortly, drop 10% quickly. Don`t worry about that, we have high capacity battery, solve these problems. And also, we company including service as following: Supply chain service. Mobile Phone Repair Parts & Accessories. Repair Tools & Materials. Refurbish Machines & Materials. Technical Support Service, Motherboard Repair. Repair Technology Tutorials. About Self -discharge, After the charging specified in the Specifications, storied the cells for 28days, then measured the capacity with 0.2Cmin till 3.0V. About Initial Impedance, Internal resistance measured at AC 1KHz after charge to shipment voltage. About Drop Test, Each fully charged Cell is dropped three times from a height of 1.0m onto a concrete floor. The Cells or batteries are dropped so as to obtain impacts in random orientations. About Vibration Test, A Cell is to be subjected to simple harmonic motion with amplitude of 0.8mm (0.03inch) [1.6mm (0.06inch) total maximum excursion], The frequency is to be varied at the rate of 1 hertz per minute between10 and55 hertz, and return in not less than 90 or more than 100 minutes. The Cell is to be tested in three mutually perpendicular directions. For a Cell that has only two axes of symmetry, the Cell is to be tested perpendicular to each axis.