Samsung G530 won't trickle charge when full?
Modern batteries disconnect your phone from the charger once it reaches 100%, which is mostly an disadvantage to many people, but the truth is, it helps from battery accidents and problems. Trickle charge is one of the reasons why batteries set on fire, usually because of heat. (But the truth is I don't know more about trickle-charging your phone, letting it reach 101%... Haha!)

An workaround to the draining battery after the disconnection is to try to turn off your phone once it is charging. Don't worry, if you're waiting for an alarm, it will turn your phone automatically.