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I am using juice defender and manually toggling 3g to off. And it was light usage yesterday.
I took a couple of videos and showed them a few times. maybe 10-20 texts and half hour of talk time. So light usage but I would normally haber to plug in. I will see if I can make it through today with light usage too.
Oh also using wifi wherever I can, and toggling that off after use.

4s since unplugged?
I quickly plugged the phone into the charger, but it's been plugged in for about 10-20 minutes now, and it's still at 13%!!! 

Uh-oh, looks like I have a HUGE battery problem after I updated yesterday!![]()
I just upgraded to the Epic on Saturday night...I friggin' LOVE this phone!! I installed LauncherPro and set up the phone exactly how I liked it. I was getting great battery life, even using the phone all day. Yesterday before the update, I took the phone off the charger and at about 7pm I was still at about 75%. Then I started playing some games and using apps, so it started draining.
At about 8pm last night I got notified of the update availability for DI18, so I d/l it and went to bed with the phone on the charger as usual. After that, the battery has been continually draining about 1% every couple of minutes!!I quickly plugged the phone into the charger, but it's been plugged in for about 10-20 minutes now, and it's still at 13%!!!
Anyone else have this problem???
Check what's sucking up the battery and see if its a background service thats been running without you knowing.
My phone updated yesterday and I've seen drastic improvement in my battery life. I even left it off the charger last night to see how it would do. Previously it would be extremely low in the morning (yesterday morning it was at 2% when I woke up). This morning it was at 72%. The big difference I see is that there's no "time without signal" anymore, where it used to be at 50% or so.