RE: Try shutting down WIFI and GPS when not used
I don’t keep those on. I shut them off and several times a day force quit all apps.
I would add that the battery life problem has only existed since the last Android OS upgrade.
All in all...give me an Apple product. My experience...they work. There are advantages to total product integration.
Verizon...you listening?
You shouldn’t use a task killer. That is harder on the battery, having to constantly restart apps. If they are running in the background they are using almost no battery.
A better idea would be to download something like Watchdog which keeps track of your processes and will alert you when one is using your CPU a lot so you can kill it. Most apps should not be using your CPU (and draining your battery) any at all in the background.