I'm fairly certain its not background processes that's killing the battery, save for any app that's doing live updates "in real time".
Having (2) different Droids, and (3) different batteries from my current phone (Moto Q), two of which are OEM, and one extended 3rd party, I've seen similar results between the two different phones and processes.
The first consistency I noticed, is that when new, a battery will need to go through a few charging cycles before it reaches peak longevity.
Seidio, the 3rd party battery mfg., states this in their instructions. You may not need to drain it completely every time during "break-in" period, but it will take a few charges before its at its best.
Secondly, as far as longevity, my batteries on both DROIDS were good for 24hours on light/normal usage after a week or so of recharging, sometimes with 40% or more of charge. Per Moto, the DROID's battery is only good for
6 hours constant use. I did a test for Chet's "LED Flashlight", where with the screen idle/dark, battery lasted 2 hours before power level dropped to 80% capacity. This with (2) POP3 accounts checking messages every minute, and every (5) minutes respectively, via 3G (I forgot to change prior to test's start...
my bad) however Network/Data usage was not the highest user.
Another similarity is that both my Moto Q and Droid last longer with screen brightness turned down (I ran Droid at (-10%) as I'm mostly indoors).
However the big drain I recently noticed, which prompted me to return the DROID, was when at my mom's house, where the DROID has little to no signal, my 24hr capable battery dropped 80% from full charge in ~4hrs as the radios struggle to find (1) bar of signal, where 90% of the time there were (0) bars. This coinsides with the 6hrs constant use rating from Moto's site.
If it were me, I'd use the phone as normal, with all the widgets running as normal, because that is one of the reasons why we got the phone. After a week or so, then determine if you're able to go a full day, factoring in 4-5 hours of "screen time", with the other hour or so allocated to "background" processes. Other than that, just hold out for Seidio's 2800-3200mA battery and cover to come out.