1. If you dont use the battery for a long time, please put it in a dry and cool place and make it full charged once every three months. 2. Replace your broken or unusable item with a new one. 3. Each item has been checked and in good condition before shipping. 4. Completely fit and work. 5. Professional installation is highly recommended. We will not be responsible for any damages to your cellphone/mobile phone that you may cause during the changing of replacement parts. 6. Warning: – To reduce risk of fire or bums, do not disassemble, crush, short circuit, or dispose of it in fire or water