Had the exact same issue about a month ago... a whole thread on this site with my big issues regarding that... But to save you the trouble, I have to say, there's nothing you can do without a charged battery, and the battery won't charge unless it can boot into Android (be it a custom ROM or stock). So you can leave it on the charger, but I guarantee the phone won't charge.... Unless you can get into clockwork recovery and install a ROM or get a charged battery from a friend/ Verizon / your friend, Verizon, then you have a nice paperweight.
I keep a spare battery nowadays and it serves as peace of mind, should such a thing happen again. And I can almost guarantee that if you buy a battery from Verizon, be it extended or stock, it should be charged enough to perform an sbf.
On a different note, it's totally ridiculous that the phone will not sbf unless charged, we certainly aren't the only ones this fatal flaw has pwned....
Anyway, best of luck to ya.
