Do NOT jailbreak.
You're happy with your iPhone like it is. Most people who jailbreak just miss some things, and a jailbreak offers these missing things. You don't miss it, it's nice as an extra, but again you don't miss it.
You're happy with your battery life, and with a jailbreak your battery will drain much faster. You should only jailbreak if you miss something, and a jailbreak offers that missing thing.