Sony SRS-XB20 Help Manual page 13

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When you switch the power source between a booted computer/AC outlet and battery by connecting/disconnecting the USB cable, the speaker

may stop sound output for a short while. This is not a malfunction.

When using the speaker for the first time, be sure to charge the battery for more than 1 hour before turning on the power.

In an extremely cold or hot environment, charging stops for safety. If charging takes a long time, it also makes charging of the speaker stop. In

these conditions, the CHARGE indicator keeps flashing in orange quickly, but this is not a malfunction. To resolve these issues, disconnect the

micro-USB cable and connect it again within the operating temperature between 5 °C and 35 °C (41 °F and 95 °F).

Do not charge in places where water may splash.

Even if you do not intend to use the speaker for a long time, charge the battery sufficiently once every 6 months to maintain its performance.