Help Identifying Part in B&D Firestorm 12v Charger

One of the parts in the charger for my Black & Decker PS130 Firestorm batteries burned up, fell off the circuit board, and got lost.
Can anyone help me identify the part so I can replace it?
There are four components on the board - a diode, an LED, a small 100 ohm resistor (bown-black-brown), and the mystery part.
Yes, I know I should buy a new charger, but I just want to fix this one if possible and get going.
Thanks for any help.
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