I get 12 hours on a a single charge my maxx HD I got over 24 hours easy with heavy use
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Not impossible if you have more than one line. I've been paying $10 for an extra line that I don't ever use...I had a Razr Maxx for almost 3 years. Went in and upgraded the extra line to the new Droid Maxx. Then I had the sales rep switch the phone to my line, replace the Razr Maxx...then I turned in my Razr Maxx for a $100 credit. I've had my unlimited data plan for now since 2008 or 2009. That extra $10 a month has paid off.
Oh, if you get the new Maxx and you want to tether your phone, do NOT upgrade to KK...keep it at JB, root it and do the entitlement hack.
I just ordered this today for my son, trading in an old droid pro, that I bought for $20 off of craigslist. In the end paying $60 for the Maxx. I have a very happy child on my hands.