Sony MDR-10RBT - Manual (Page 19)

* Time required to charge the empty battery to its full capacity
Notes
Use the micro-USB cable supplied. You may not be able to charge
the headset with other cables.
This headset cannot connect via BLUETOOTH while charging.
If the headset is not used for a long time, the indicator (red) may
not light up when you connect the micro-USB cable to charge the
headset. In this case, do not disconnect the micro-USB cable from
the headset and wait until the indicator (red) lights up.
Tips
If the micro-USB cable is connected to a computer while the
headset is turned on, the headset will be turned off automatically.
To charge the headset from an AC outlet, use USB AC Adaptor*
(sold separately). For details, refer to the manuals supplied with
the USB AC Adaptor.
The headset cannot be turned on while charging the battery.
* Refer to the Reference Guide on the recommended adapter.
Caution
If the headset detects a problem while charging, the indicator (red)
may turn off, although charging is not complete.
Check for the following causes:
Ambient temperature exceeds the range of 5 °C – 35 °C (41 °F –
95 °F).
There is a problem with the battery.
In this case, charge again within the above-mentioned
temperature range. If the problem persists, consult your nearest
Sony dealer.
Notes
If the headset is not used for a long time, the battery may be
quickly depleted, however, after a few recharges, the battery life
will improve.
Even if you do not intend to use the headset for a long time,
charge the battery to its full capacity once every 6 months to
maintain its performance.
If the headset is not used for a long time, it may take longer to
charge the battery.
If the life of the built-in rechargeable battery drops to half the
normal length, the battery should be replaced. Consult your
nearest Sony dealer for replacement of the rechargeable battery.
Avoid exposure to temperature extremes, direct sunlight, moisture,
sand, dust or mechanical shock. Never leave the headset in a car
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