General Battery Life with & w/out extended battery

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http://androidforums.com – Hello all, Most likely going to purchase a new phone tomorrow, either a Gnex or a Maxx. Love the Gnex, but the battery life scares me. A guy I know claims to make it from 7am to 5pm on a charge, and to me that's just not good enough. Anyone here use the extended battery, and can give a non-root user an idea of the life in hours during an average day? (General)