...had low power last night after cold front/t-storms went through for a few hours so used 3G/cell/GPS quite heavily reading new, checking outage, phone, etc... anyways...
so far on my FIRST charge with the 3500mah Anker I'm @ 50% batt with 1d 14h 7m running on batt... not too shabby, and WAY WAY WAY better than stock.
Bear in mind my usage pattern is generally light, but with the new batt I've been leaving cell/3g on(no 4g unless I go a few miles N) which I used to ALWAYS turn off unless using 3g/cell or expecting messages/calls to save batt, also avoiding GPS whenever possible(most of the time) as on the OV and MT GPS would quite literally suck the batt dry in almost no time.
NOTE:  I also had one reboot while using yesterday, and then a total unresponsiveness just before power was fully restored(I assumed off batt meter and dead batt), BUT attaching to charger got nothing -> pop cover and it would seem that the batt had shifted completely away from the contacts, so I'm also guessing the reboot was from a temp shift of the batt away from the contacts... i.e. may end up needing a shim but so far so good today.
ADD'L NOTE:  Had almost constant rebooting loop one evening earlier in the week and the phone was stationary at that time with the stock batt, so reboot may not ALWAYS be from a shifting batt... I'm guessing those boots were Sprint/VM screwing with their network in my area as the next morning it was fine all morning with stock batt(i.e. no rebooting) so instead of exchanging I decided to try my new 3500mah Anker that had just arrived and that's where I still am ATM... Still FIRST charge cycle so, it's looking like I'll need 10d or so to go through 5.