In order to keep the battery in good condition, do not let it charge for more than 8 hours. (energysistem.com)
Closing your notebook and placing your smartphone on top to let it charge overnight is a big possibility, while creating a wireless charging dish on a PC tower has already been done. (slashgear.com)
The smartphone also has a reverse charge option that lets you charge other devices through its massive battery. (techone3.in)