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Charging and usage hours
Approx.
Approx. usage time*
changing hours
MDR-RF820RK
1 hour
80 minutes*
16 hours*
2
18 hours*
1
at 1kHz, 1mW+1mW output
*
2
hours required to fully charge empty batteries
*
3
*
Time stated above may vary, depending on
the temperature or conditions of use.
Using the headphones with dry
batteries (sold separately)
Commercially available (size AAA) dry batteries
can also be used to power the headphones.
Install the batteries in the same manner as
described in steps 1 through 3 of "Charging the
supplied rechargeable batteries."
When dry batteries are installed, the battery
charge function is not activated.
Battery life
(Using Sony alkaline battery LR03/AM-4(N))
Battery
MDR-RF820RK
MDR-RF850RK
1
at 1kHz, 1mW+1mW output
*
2
Time stated above may vary, depending on
*
the temperature or conditions of use.
6
MDR-RF850RK
3
75 minutes*
3
15 hours*
1
Approx. hours*
28 hours*
2
24 hours*
2
Notes on Batteries
• Do not charge a dry battery.
1
• Do not carry a dry battery together with coins
or other metallic objects. It can generate heat if
the positive and negative terminals of the
3
battery accidentally come into contact with
3
metallic objects.
• If you are not going to use the unit for a long
time, remove the battery to avoid damage
from battery leakage or corrosion.
Checking the remaining battery
power
Pull up the self-adjusting band and check the
power indicator located on the upper part of the
right housing. The batteries are still serviceable
when the indicator lights in red.
Charge the rechargeable batteries or install new
dry batteries if the power indicator light dims,
flashes, or the sound becomes distorted or noisy.
Note
The rechargeable nickel-metal hydride batteries should
be replaced with new ones when they last only half the
expected time after a proper recharging. The
rechargeable batteries type BP-HP550 are not
commercially available. You can order the batteries from
the store where you purchased this system, or at your
nearest Sony dealer.
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