Sony YY7854E Help Manual page 91

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The speaker becomes warm during charging. This is not a malfunction.

Avoid exposure to rapid temperature change, direct sunlight, mist, sand, dust, or mechanical shock. Also, never leave the

speaker in a car parked in the sun.

As long as the speaker is connected to an AC outlet by the supplied AC power cord (mains lead), the speaker's built-in battery is

capable of charging itself even while the speaker is turned on.

However, it may take a long time before charging completes depending on the usage of the speaker. It is recommended that you

turn off the speaker before battery charging.

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 power cord (mains lead) from the speaker and connect it again within

an operating temperature between 5 °C and 35 °C (41 °F and 95 °F).

At high temperature, the charging may stop or the volume may reduce to protect the battery.

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