Please make sure to fully charge and discharge your new battery 3 to 5 cycles.2. Please make sure the new battery contacts and phone are fully connected.3. Please use your original charger and cable to charge this battery.4. At the first beginning, the battery will drain quickly, this issue is caused due to the unstable li-ion of a new battery, it will become normal after long-term use.please notice that use up all the power of Battery