Ipod Touch battery drains quickly unless being used

Have you tried any of these battery saving tips?

Turn Brightness down on your iPod's screen

Turn off Bluetooth when NOT using a Bluetooth device.

Turn OFF Background App Refresh.

Turn ON Reduced motion

Make sure you have iOS Mail app set to fetch mail less often OR set it to only manual fetch when you launch or access the iOS Mail app.

Hey there, Belleliz.

After reviewing your post, it appears that the battery of your iPod touch drains more quickly when it's not being used.

About the battery usage on your iPhone, iPad, and iPod touch -- You can use this article to determine which application(s) or service(s) are using the most power.

Maximizing Battery Life and Lifespan -- This article contains great general and specific steps you can take to maximize your iPod's battery life. Don't neglect "Tips for iPhone, iPad, and iPod touch" for steps specific for your iPod. After you apply any step, test your device's battery for a bit and report back your findings.

Let me what you find and take care!

An iPod Touch 5th gen CANNOT be upgraded to iOS 10 much less iOS 10.3.3.

What iPod Touch do you have?

An iPod Touch 5 can only be upgraded to iOS 9.3.5.

Did you purchase a newer iPod Touch?

Have you tried a hard reset of your iPod by holding down both the Home and sleep/wake buttons simultaneously until your iPod goes to black and restarts with Apple logo, then release the buttons?

Good Luck!