Take a look at this; the linked file in this thread should help you out:

http://androidforums.com/droid-x-all-things-root/272212-bootloader-stuck.html

 

Nowhere. It will not charge in bootloader. Find external charger or borrow battery from someone, or go to Verizon store and ask them to charge battery for you

 

Or you can try this if you are up to it (post #17):

http://androidforums.com/droid-x-all-things-root/270129-i-think-my-droid-x-goner.html

 

I've noticed a lot of people lately have been encountering the same situation you just went through.

If ever you (or anyone for that matter) decide on doing any major mods to your phone, make sure you are at 100% charge, or at least very close to it. In my case, I don't have to worry too much about it because my girl has a DX too, and we both have extended batteries; so all together we have 4 batteries

Anyway, enough of my ranting, glad you've got it working once again.

 

+1

 

I had a similar experience where my phone was stuck in a bootloop, and I couldn't SBF it because the battery was too low.

My solution was to use the old battery I had for my motorola q9c (my previous phone before My Dx).

The battery was the same voltage, and the contacts were the the same size. I took a chance since I have an external charger for those batteries.

Voila, taped the battery into place (since it wouldn't fit otherwise), but it worked good enough to SBF my phone..

 

Had this same problem on my friends DX, the following solved the problem for me:

Pull battery
Wait one minute
Plug in wall charger
Replace battery
Power on

It then displayed an empty battery icon with a 0% inside of it, we just let it chill and do it's thing then liberty eventually loaded. I don't know what it is about mod'ed phones but they don't like to have their battery be super low... noticed the same on my Ally.