After Jailbreaking your iPod touch or iPhone you’ll have an SSH server running, necessary when first installing new applications, but once you’re done it continues to run in the background, even when not in use and can significantly drain your battery. But there is a solution, Services.app, a community application that lets you disable certain services including SSH.

Step 1: [OPTIONAL] Follow my guide to replace Dropbear SSH with OpenSSH.
Step 2: Install Services.app though Installer.app. It will be in the Utilities section. If you can’t find it, make sure you have Community Sources installed.
Step 3: Run Services.app.
Step 4: You should see several switches, Edge and Bluetooth are superfluous on the iPod touch even though they may appear to be on. The switch you’re interested in is the one marked SSH, simply turn it off when you don’t need SFTP/Shell access to your device, which should be 90% of the time. If you see two SSH switches, please follow my guide to remove one of them.
Step 5: You’re done!

You should see a boost in your battery-life if you’ve been using your iPod touch/iPhone with SSH running.