Sony SRS-X3 Quick Start Manual page 49

Note
When you use the speaker at a loud volume, the battery may run low, even if the speaker is connected to the USB
AC adaptor. If you want to use the speaker while charging, lower the volume of the speaker. Otherwise, turn off the
speaker and charge the battery fully before use.
When you switch the power source between USB AC adaptor and battery by connecting/disconnecting the USB AC
adaptor, the speaker may stop sound output for a short while. This is not a malfunction.
The maximum power output will be lower when the battery is running low.
In an extremely cold or hot environment, charging may end prematurely or may not be possible.
When the battery is running low, even if you press the
CHARGE indicator flashes in orange 3 times. This is not malfunction.
Even if you do not intend to use the speaker for a long time, charge the battery to its full capacity once every 6
months to maintain its performance.
Related Topic
Turning the power on
Notes on charging
(power) button, the speaker may turn off after the
Notes on use
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