Motorola S9 not charge - Motorola Mobility MOTOROKR S9 Wireless Headset for Bluetooth-Enabled Cell Phones - Black/Red

S9 Indicator Lights

Mark
Motorola Support

Have you tried plugging into a different charger to ensure it is not your charger?

Mark
Motorola Support

Bluetooth headsets, like many portable devices can be charged on a USB port on a computer, which supply less than 1A, so either charger would be suitable.
Looking at the manual, a full charge should take two hours, so half an hour seems a little quick.
Perhaps it was part charged?
You could see if you can listen to music for six hours on a charge, and if so how long it takes to charge then.
The manual can be found here.S9 user guide - Motorola

how to charge and switch on Motorola S9-HD wireless headphones...please help me

Make sure you're using the right USB charger. Just because the plug is similar in shape doesn't mean the correct voltage is getting to the headphones.

make sure you charge the S9 using a motorola mini usb AC charger or a mini USB cord plugged into a live port.
press and hold the circle vertical bar until the light is steady blue and pair it with your bluetooth device. you only have two buttons at the rear of the device under the motorola logo.

try a new battery, and if you already have, check the copper contacts on the battery and phone for corrosion, otherwise the problem may be internal.

I had the same problem but instead of a red light it would flash green twice and stay off. I could not find the original charger and another plug in charger would not work. I plugged it into my computer with a usb cable and after several seconds it started charging.

does your laptop have a2dp bluetooth profile

this profile is needed to play music

I did exactly what geozep0 indicated in his comment with similar successful results. I called the Motorola customer service number: 1-866-289-6686. Per the representative I spoke with, Motorola's standard warranty policy covers the entire unit (including the earbuds) for one year from the date of purchase.
They are sending me new earbuds free of charge.
Success!