What most people tell you is that closing your apps will save your battery life because it keeps the apps from running in the background.
via The Ultimate Guide to Solving iOS Battery Drain — Overthought
easily moving sshd off tcp:22
If you are in a campus computing environment or otherwise on the public Internet, you are probably having someone look through the windows and jiggle the doorknobs every few hours. These brute force attacks sometimes allow someone access to a system with a common password, in addition to causing your workstation to be spinning up dozens of sshd processes.