How is the battery life on the new iPod Touch G5s

I believe that you’re looking for the info straight from Apple’s iPod Battery’s Page., which contains all the information that you need to keep your battery as healthy as possible.

In any case, as with any other modern battery, avoid excessive heat not only when recharging but also when the device is not in use.

• Restart the iPhone (press and hold Home and the top button simultaneously till you see the slider to turn it off, and then slide the slider. Once off, press and hold the top button to turn it back on)
• Turn off Bluetooth (Settings > General > Bluetooth) if you're not using it.
• Turn off the WiFi option "Ask to join networks" (Settings > WiFi) to keep the WiFi radio from constantly scanning for new networks when you're not connected. It will still remember and auto-connect to networks that you've connected to before, but you'll have to manually connect to any new networks.
• Turn "auto-brightness" off (Settings > Brightness) and set the brightness level lower. I would only do this as a last resort if nothing else seems to work.
• Let the battery run all the way down to zero (i.e. let the phone run till it won't turn on anymore), and then recharge it all the way to full.