The Bialetti Milkfro is not battery-operated. Likewise, there are also only stick milk frothers that are battery or rechargeable battery operated.

Depends on the milk. I need it with soya milk. Barista Edition always works.

No, it is not dishwasher safe. We have gathered some informations regarding the cleaning: Cleaning: Disconnect the plug from the socket before cleaning. Do not immerse the device in water under any circumstances. The device is easier to clean if this is done immediately after use. Do not use chemical products or abrasive cleaners. Instead of milk, pour water into the frother, close it with the lid and start the machine. This heats the water and "froths" it, so that milk residues are released from the inside of the device. When the process is finished, empty the device and remove the remaining residue with a soft sponge. Clean the hot milk frother, lid and silicone ring with hot water and detergent (do not put in the dishwasher). Wipe the outside of the appliance with a damp cloth only. Always wait until the appliance is completely dry before putting it away. Translated with www.DeepL.com/Translator (free version)

Yes, there is an attachment to froth the milk to make lots of foam and another that you can use if you just want to heat the milk (and a little bit of froth).

No, but an adapter is included.