Originally Posted by Cilraaz
My guess is that he's in a fringe 4G area and the radios are struggling for signal, which can cause a large amount of battery loss.
This is what I would expect too. When the phone is on the border of a 4g area and constantly switching between 4g/3g, the battery gets drained rather quickly.
You say the phone loses battery when the power is off? Do you mean the phone is completely powered down, or just the screen is off? If the phone is completely off and the battery is draining, then it's time for a new battery. If just the screen is off, then it's either the radio doing the damage, or a rogue app. The problem is, like other have said, that you have to be rooted to really pinpoint what is causing the issue. If you are not rooted, a rogue app can easily be discovered in the stock battery stats by charging completely before bed and letting the phone sit overnight. Ideally you should be getting a 1-2% drop per hour while the phone is idle. If there is an app eating battery in the background, it will be high on the list when you wake up.
I can't stress enough how much a good kernel can help with battery life. Imnuts did a great job with PBJ and I'm reaping the benefits
. I'm not on my phone all that much, but this is typical battery life for me (about 1:30 hrs of screen on time):