Sony SRS-XB41 Help Guide - Page 9
Turning the power on, Notes on charging
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When you use the speaker at a loud volume for a long time, the built-in battery may run low even if the speaker is connected to an AC outlet. As a result, sound becomes low. This is not a malfunction. Turn off the speaker and charge the built-in battery sufficiently. The maximum power output will be lower when the built-in battery is running low. 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. To resolve these issues, disconnect the AC adaptor or micro-USB cable, and then connect it again within an operating temperature between 5 °C and 35 °C (41 °F and 95 °F). Do not charge in places where water may splash on the speaker. Even if you do not intend to use the speaker for a long time, charge the built-in battery sufficiently once every 6 months to maintain its performance. Related Topic Turning the power on Notes on charging 4-735-507-11(1) Copyright 2018 Sony Corporation 9