with constant use (ie screen on an I'm doing something 85%-95% of the time) I get 4-5 hours of battery life.
I do not have the network issue to do anything about,
I do not have more than 1% or 2% time without a signal,
that is not using wifi,
not using 4g,
not rooted,
not using you tube (because it never works, locks up after less than 1:30 on every video and I have to task kill it manually),
not using video chat,
not using IM at all,
google talk is auto killed and not running,
facebook is set to sync manually,
news is also auto killed,
flicr is set to manually sync,
peep is the only twitter account app and is also set to manually sync,
my email syncs every 3 minutes during peak hours (9-5) and every 30 mins off peak.,
my phone is not set to use GSM towers,
manually selecting CDMA again (it is already selected) does not change the battery life,
your memory card has nothing to do with your battery,
I have done a hard reset,
I do have the new update.
GPS is almost always off, never on for more than 5 minutes unless I am actively using it,
weather sync is set to manual
using HTC sense
not using ATK or ATM
NOW, I do get 15-22 hours of battery life when I charge in the evening to 100%, then unplug the phone after 10pm, turn off mobile networking, turn off syncing, turn off wifi (if on), turn off the auto screen brightness, kill all games and xScope (web browser) manually, then leave the phone on (for my alarm clock) and do not play any games for more than 3-5 minutes at a time, with light web browsing and email reading (read 2-4 hours spread out over the rest of the time). I can normally make it until 330pm or 430pm and I'll have 10%-25% battery left, I have left it until 6pm before charging and still had 8%-9% battery after talking on the phone for 10+ minutes at 5pm. but that is a normal, non-Evo, usage day.
I do have an Evo now, and I DO use it a LOT more than my old phone (HTC Touch), and the battery DOES last longer than my HTC Touch did with it's 2.2 inch screen. am I unhappy with my battery life? NO WAY, getting more than 6 hours for me is awesome! Am I still patiently waiting for my 3500mAh battery from Seidio? HELL YES! Do I think it will make the phone too thick? HELL NO!! even with the 3500mAh the Evo will be thinner than any slider Android phone ever made (before the Evo launched), and will only bee 1mm or 2mm bigger than my HTC Touch. I can't even describe to someone one what 1mm is/looks like/feels like, so how will I notice it? if anything it means the back of the phone will touch my hand while I am holding it, I say that is good, that means I can grip it better and it is less likely to be dropped.
Now back to the OP post, I would get that back cover IF I could find one with a sweet design, or completely clear, as I want the red to show out, but not looking like that...