Notes on charging

Life span of the built-in lithium ion battery

  • 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.

  • If the speaker is not used for a long time, it may take longer to charge the built-in battery.

  • The rechargeable built-in battery has a life span. As time passes and the number of times that the built-in battery is used increases, the capacity of the rechargeable built-in battery slowly decreases. When the amount of time that the built-in battery can be used seems significantly shorter, despite having been fully charged, contact your nearest Sony dealer.

  • When the amount of time that the built-in battery can be used seems significantly shorter, it could mean that the rechargeable built-in battery has expired.

  • The life span of the rechargeable built-in battery differs depending on the usage, environment, and storage method.


When the speaker detects a problem for the following causes while charging the built-in battery, the CHARGE indicator (orange) turns off even if charging is not completed.

  • Ambient temperature exceeds the range of 5 °C – 35 °C (41 °F – 95 °F).

  • There is a problem with the built-in battery.

  • When charging to the built-in battery continues for a long time.


  • Charging time varies depending on built-in battery usage conditions.

  • Charge the speaker in an ambient temperature between 5 °C and 35 °C (41 °F and 95 °F).

  • 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 adaptor, 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 adaptor 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.

  • Use of a USB hub is not guaranteed for battery charging.