Moto H500 charging light ever turn off?

RTFM: "When the headset battery is charged (about 2 hours), the blue indicator light turns off."

I received my H500 headset in the mail a couple of nights ago. Step 1 is to charge the battery, so I put it on the charger. Blue charging light went on. Five hours later the blue light is still lit :confused:, so I took it off the charger. I've fried NiCads by overcharging them, and I don't want the headset to fry its LiIon battery. Is 2 hours not sufficient to charge the battery, or should I exchange the headset as defective?