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Battery stays constant, no matter what the state of charge is. It can be charged via USB, either plugged into your computer or a wall adapter. It comes with a USB cord.
Sorry, there was a problem. Please try again later.Hello, Lincoln. Thank you for your interest in the Soundlink Color Bluetooth Speaker II. The battery level of the speaker would not affect the maximum possible volume. The speaker comes with a USB charging cable, which can be connected to your computer. You can also connect this cable to a 5V, 1 Amp USB wall charger, available at any electronics store. If you own the speaker and you're experiencing difficulty with its volume, please don't hesitate to reach out to our support team at 1-800-367-4008 for further assistance. They are available M-F 9 AM to 9 PM Eastern. Thank you, and have a great day! Jesse - Bose Support
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