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IHateMyTreo, are you by chance running the HTC battery widget? This completely killed my battery on my Eris (with 2.1). Once I uninstalled this widget battery was time was great. I have also been doing the airplane mode trick. I would look at the threads over on Eris forum related to apps that are creating battery issues.
NKT -- link to discussion on 'fixing' Handcent?
Ah, I was worried -- planning on using Handcent.![]()

I had this same problem on my Eris when I First installed 2.1 my battery was not even lasting half a day did the Airplane Mode trick and BAM!! my battery is back to lasting a full day with no problem can even get almost 2 days on lite use
Actually its a bug in os 2.1, its well documented in the eris forum. Try this put your phone into airplane mode, wait a couple seconds and take it out of airplane mode. This should fix the issue until you reboot your phone.
IHateMyTreo and bxlxaxkxe, are you by chance running the HTC battery widget? This completely killed my battery on my Eris (with 2.1). Once I uninstalled this widget battery time was great. I have also been doing the airplane mode trick. I would look at the threads over on Eris forum related to apps that are creating battery issues.
Not using battery widget.
Trying Airplane Mode trick.
Field Trial Mode says from -79 to -81dbm for RX Power; from -6 to -15.5db for RX EC/IO
Already had weather and location disabled, no BT or Wi-Fi
The battery drained by 80%, not to zero, after 3.5 hours. Email traffic was only light at around 30. Light phone use, plus one video shot.
So like I said, signal levels have the biggest impact on power usage.Ec/Io (pronounced "ee-see over eye-not") is basically a measure of how well your phone can hear the tower over all the other traffic on the channel. (Don't forget, you are sharing the 1.25 MHz channel with many other users).
A reading near 0.0 is very good. You can find low readings late at night on weekdays when traffic is low. When the reading is high (-12.0 to -15.0), quality will drop and you may even lose the call.
It's funny because I've read reviews from tech sites that say they get a day's worth of battery life after moderate to heavy use, and on the other hand the OP gets 3.5 hours. My first guess would be that you have a bad battery. 3.5 hours is ridiculous for any device no matter what it's running. Sense is definitely not the problem.

Your signal appears to be marginal. EC/IO is pretty bad. EC/IO is basically your signal to noise ratio. The higher the number the worse it is.
New England Cellular Sites :: LG Phone Field Test
So like I said, signal levels have the biggest impact on power usage.
But if you continue to have short battery life, I would have them swap out your battery or even swap your phone.
There's unless you have something else running in the background there's no reason you should see those results.
I was going to just test Youtube vids in fringe areas.