I'm glad I'm hearing this from other Maxx owners. I was leery of the 21hr claim. I knew at best you'd get maybe 12-15hrs talktime barring no other calls coming in, no notification rings or lights, and no other apps running... impossible. The guy at Verizon that sold me the phone actually told me "it'll do 21hrs REGARDLESS of what I'm doing". I said "I can spend 21hrs downloading apps?"... he tells me oh yes :/ I asked what if the battery isn't giving me 21hrs to which he said bring it in and we'll get ya a new one. I plan to use that advice... more than once if that's what they're standing by. This is just "the 1st" in longlife mobile batteries claiming extra-long life. It won't be tried and true for another 2yrs. Even then they'll be saying 48hrs and you'll be luck to get 24hrs... LoLI have everything turned off except missing call reminder, battery indicator, dataoffload, and yahoo mail. I have never had more then 30 something hrs of standby. My phone has everythig becides these apps on auto end. im at 79% after only 15hrs on standby.
I've been getting 48-52hrs standby with a minimum of activity. Use wise I can see it puttering out after 12hrs.