Is external battery charging possible?

I landed an LS980 into QHSUSB_bulk mode. While I was transferring the replacement partitions over it appears the battery ran dry. It no longers will charge at all, but will show up in Linux complaining about not enough power to full power on (ehci error -110?).

I would like to know if there's a way to charge the battery some other way, or if anyone has any other ideas. Surely I'm missing something obvious here.

Thanks!