Smartphones have strict control to battery. Mobile phones will switch to standby mode to avoide absorbing exceeded current power. Any damage to lithium battery life from overnight charging could be negligible
wireless charger can resist unreasonable waste of electricity in charging process. They also automatically recognizes different devices and energy requirements for “personalized work". They could automatically indentify different smartphone model to provide proper power watt supply. When charging is required, the transmitter and receiver chip will start working automatically at the same time. When fully charged, both parties will automatically turn off.