Make sure your charger and cable are still good and provide turbo charge. Also if your battery drains fast you should replace it and a bad battery also could take less power at charging, so that's why it doesn't turbo charge. Also try to clean your charging cable and port with a toothbrush with some alcohol on it. Be careful put a small amount of alcohol on your toothbrush and not directly to the port and before plug your charger on, make sure it is dried.