Power bank function

Power-bank functionality is consistently praised. Reviews mention USB-C device charging, phone top-ups, and 30W power delivery as useful for long outdoor sessions.

The USB-C port can charge external devices, and multiple reviews present that as a meaningful convenience feature.

The power bank feature is broadly mentioned and often praised as practical in emergencies. Reviewers note that USB-C reverse charging can top up a phone or small device, though Technobezz calls it more of a backup feature than a full replacement for a real power bank.

The power-bank feature remains a key differentiator. Reviewers commonly note it can top up phones and small devices via USB-C, but it is not meant to charge laptops.

Power bank use is a highlighted perk, letting you charge a phone from the speaker, with at least one review noting you should pay attention to charge direction behavior depending on speaker power state.

The power-bank function is one of the most repeated practical extras, positioned as useful for emergency phone top-ups rather than full charging.

Reverse charging is called out as a useful extra for outdoor use, letting the speaker top up a phone in a pinch. Reviewers imply it is convenient but will reduce total playback time.

USB-C charge-out works as a practical emergency top-up for phones, but reviewers stress it draws from the speaker's battery and can shorten playtime. It is helpful, but not a dedicated power bank replacement.

The speaker can charge another device, and that power-bank behavior was explicitly mentioned in two reviews.

The USB-C port can charge phones and small devices, making it handy for camping, tailgating, or emergency top-ups.

The USB-C port is presented as capable of topping up a phone, but one reviewer could not get it working reliably, so this feature looks inconsistent.

The only direct evidence says the Willen II does not include a portable power-bank feature.

One review explicitly notes you cannot use the USB-C port to charge other devices, so it does not function as a power bank.

Power-bank function is absent; several reviews said the Bose cannot charge other devices or lacks power-bank operation.

The speaker does not function as a power bank; the USB-C port is for charging the speaker itself, not for charging phones or other devices.

Power-bank capability is absent. Reviewers explicitly say it cannot charge a phone, cannot top off a device, or is not reverse-chargeable.

Reviews explicitly note you should not expect to charge a phone from this speaker.

The USB-C port is not designed for power-bank style reverse charging, so it will not charge your phone or other devices.

At least one reviewer explicitly notes you cannot use the Flip 7 as a power bank to charge your phone via USB-C.