First thing I would do is nothing. I'd let it charge for a while. Can you tell me what phone you have, are you currently rooted or in the process of rooting and I'll try to get you to the right area.
i have thesame problem it wont charge the phone for me either using usb or wall charger im having to swap batteries any idea what bp passthrough mode is ? then phone disconnects?
Unfortunately, you're going to have to get the battery charged up first. If it's not charging via the phone, then find a friend with a droid that can charge it for you, or buy a battery only charger.