games consume power because games utilizes the power of the cpu processor, graphic processor, and your screen is on with lots of colors. this game consume about 10% to 20% per 20 min on average. so I guess that your reading of 46% drop is reasonable taking an average of 15% per game.
Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
Press the Volume down key several times in order to highlight “Wipe cache partition.”
Press the Power key to select.
Press the Volume down key to highlight “Yes” and press the Power key to select.
After the wipe cache partition is complete, “Reboot system now” is highlighted.
