By now, we know that lithium batteries can catch fire on planes.

The Transportation Security Administration and Federal Aviation Administration have been flagging devices like portable power banks, laptops and cell phones for a while, urging travelers to carry them on board instead of checking them with their bags.

What may be surprising is that this also applies to electronic toothbrushes, as TSA recently reminded travelers on Sept. 4.

According to TSA, electronic toothbrushes are allowed in both carry-on and checked baggage, but there are special instructions.

In general, those with lithium-ion or lithium-metal batteries should also be carried on board, where flight crews can recognize and respond to lithium battery fires, according to the FAA. TSA adds, “Any spare or uninstalled lithium batteries must be placed in a carry-on bag.”

If travelers want to check electric toothbrushes or other lithium battery devices in with their luggage, the FAA says “they must be completely powered off and protected to prevent unintentional activation or damage.”

In August, TSA updated its rules to ban some hair styling tools, such as cordless curling irons, from checked luggage on planes.

Travelers can also peruse this alphabetized list of what’s allowed on board on TSA’s website.

This article originally appeared on USA TODAY: If you have this type of toothbrush, TSA recommends you don’t check it

Reporting by Eve Chen, USA TODAY / USA TODAY

USA TODAY Network via Reuters Connect