Power bank function

The Charge 6 doubles as a USB-C power bank so users can top up phones and other small devices during outings, making it handy for charging a phone or tablet in a pinch even though it cannot meaningfully recharge a laptop and doing so shortens the speaker’s own runtime.

Reviewers appreciate that the Move 2’s large internal battery can act as a USB-C power bank in a pinch, with tests showing it can add a substantial charge to a phone in a couple of hours while only using a modest portion of its own capacity, making it convenient for top-ups away from wall outlets.

Reviews appreciate that the rear USB C port on the SoundLink Max can reverse charge a phone when the speaker battery is well stocked, adding a handy emergency power bank style function for outdoor or travel use, though drawing power this way will shorten overall playback time.

The Bounce’s USB C port can charge external devices, letting it double as a modest backup power bank when needed.

Unlike some rivals, the Flex 2’s USB C port cannot be used as a power bank, and a few reviewers say they would have liked the option to top up a phone from the speaker.