Your ipod touch has many ways you can conserve your battery. The first major way to have your battery last a long time is to go into your settings icon first. Select the brightness tab and it takes you to where you can set your backlighting to a normal view. Turn down your brightness to a comfortable level. You will also see a auto-brightness on off tab. Select off. When done hit your home button. This alone will set your power consumption to a managable level.
Another thing you can do is select your setting icon again. Hit your fetch new data tab. You should have a push button. Select on. Now scroll down to the bottom of the page and you should see a manually tab. Select manually. This will help your ipod touch to only get email to your itouch when you are ready to look at your email instead of constantly turning on and fetching your email in real time. This will help your ipod touch to be in a standby mode until you are ready to fetch your emails and ready to read them. When done select your home button.
Another thing you can do is select the settings icon again. Select the wifi tab. In your wifi networks screen select off on your ask to join networks tab. This will help your ipod touch from constantly scanning to search for a wifi connection which will drain more of your battery. Select the home button when done.
Another thing you can do is select your settings icon again. Select the general tab. Now select the auto lock tab. Once in, select the 1 minute tab. This will help shut your ipod touch off after 1 minute so you can conserve energy. This is the major way to conserve and save battery life for your ipod touch.