How to Install a Battery in Your Sony MDR-NC6 Noise Canceling Headphones. You will need to install a battery into the Sony MDR-NC6 Noise Canceling Headphones for them to work. You will need one R03 (size AAA) battery. Depending on the type of battery chosen, you may get 15 to 30 hours of running time on your headphones. Here is how to install a battery in the Sony MDR-NC6 Noise Canceling Headphones.
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Open the lid of the battery compartment located at the right inner side of the headphone by sliding the lid to unlock it.
Insert one R03 (size AAA) battery by matching the positive (+) and negative (-) signs on the battery with the positive (+) and negative (-) signs on the battery compartment.
Close the lid by sliding the battery compartment and locking it.
Replace the battery with a new one when power indicator dims.