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Wow, the misinformation in this thread is staggering. Jailbreaking doesn't automatically make your battery drain faster or make it any more or less stable than it already is. My advice to you is if you don't know the specifics, stay away from jailbreaking.
Also, google + macrumors are your friends, do a search on them if you wanna REALLY be informed about what jailbreaking does and does not do.