Hello Vaughn1124,
Thank you for posting in Apple Support communities. We understand that you are noticing that the battery is draining quickly when playing a high graphic game. We would love to provide you support on this.
The iPad Air 4 that you own is designed to use the battery that the program in use demands. Since you noticed that normal use of the iPad doesn't drain it quickly but certain games do, then it would be up to your discretion of when you should play the game and if you should keep a charger handy.
Keep in mind that just because the battery drains quicker when playing the game doesn't mean that the game damages your battery at all.
Here are a couple helpful resources to tell you about your battery function and health:
Maximizing Battery Life and Lifespan
About the battery usage on your iPhone, iPad, and iPod touch
If you continue to have concerns, you may need to contact Apple Support and request remote battery diagnostics to be ran.
Thank you for allowing us to support you.
Have an awesome and productive day!