If you were using a LiPo, its probably toast. I did the same thing a while back and ruined a nice 3cell pack.
Depending on what LiPo you were using, I would measure the individual cell voltage. Its possible to blow the pack up if it trys to charge one cell up to full voltage if the other cell is bad.

Unfortunatly most chargers dont charge individual cells. They just try to pump the voltage in.

Example

A 2 cell pack should have roughly 4.6V per cell on a full charge.
If one cell is bad and will only hold 3V, the charger will try to put the remaining charge in the good cell.