Why is my phone won't turn on after I charged it?

Last night I checked my battery percentage and it says 9%. I immediately charged my phone and after several minutes of charging, it turned off by itself and until now it won't turn on. I keep on removing the battery and charge it again but nothing works. I doubt it wasn't dropped and maybe the battery is drained? What is the best solution to this? I'm looking forward for your answers. Thank you guys!