This recent directive from the Transport Safety people does as much to obscure and confuse as it does to communicate. Its random emphasis is particularly unhelpful.
The rules categorise lithium-ion batteries into three classes by means of their “lithium content equivalent”. These classifications are not labeled on batteries, but translate roughly into Normal (<100wh), Large (100-300wh), and Professional (>300wh).
Each person may check or carry on at most two large batteries.
We may not put any uninstalled spare lithium-ion batteries of any size in checked bags. It is permitted, but discouraged, to put lithium-ion batteries in checked bags if installed in devices.
The United States needs The Plain English Campaign.
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