Here are a few settings you can play with to conserve the battery power on your Zune.

Turn off wireless: Select Settings > wireless, and select wireless:off.

Lower the backlight time: Select Settings > display, and select backlight:1 or 5 seconds.

Lower the backlight brightness: Select Settings > display, and select brightness: low

Use the Hold setting: Set it to Locked when you are not using the device. This will prevent the device from playing accidentally.

Keep the device in a cool environment: Lithium-ion batteries like the one in the Zune like cooler environments. Keeping the device in a cooler environment will make the battery last a bit longer.

Use these tips and keep your Zune providing you with hours and hours of play time. Listed below are the average times a Zune device lasts per full battery charge.

Zune 4GB: 24 hours
Zune 8GB: 24 hours
Zune 30GB: 14 hours
Zune 80GB: 30 hours