Yes, and in either bag. A lithium battery that is installed in a device may fly in carry-on or checked baggage; it is spare batteries that have to stay with you in the cabin.
That is the rule the TSA and the FAA publish for flights in the United States, and it is worth getting the right way round: the restriction people remember applies to loose cells and power banks, not to the trimmer with its battery inside. A cordless trimmer, shaver or clipper travels like any other small appliance.
Two cautions that follow from it. A spare battery or a power bank goes in the carry-on and never in a checked bag — that is covered on its own page, can I take a cordless trimmer in carry-on baggage. And a tool that switches itself on in a bag is a tool that arrives flat, which is what the next point is for.
A travel lock stops the trimmer powering up against the inside of a case. Panasonic states one on its ES-ALT4B shaver; several of the American trimmers here implement it as a long button press, and what a travel lock does lists them.
The voltage belongs to the destination, not to the flight. A tool marked 100–240 V works anywhere with a plug adapter, which changes the shape of the pins and nothing else. One marked with a single voltage needs a converter, which is a different and heavier device — do I need a voltage converter sets out which is which. The figure is printed in small type on the body of the tool.
A hard case protects the blade, which is the part a knock puts out of alignment, and keeps the guards together. The travel cases shelf is where to look.
For a particular flight, the airline’s own published conditions are the authority — they can be stricter than the federal rule, never looser.
Last reviewed October 10, 2026