These devices are small, provide rapid results, and are low in price; however, the simplest method to detect lithium is from its characteristic red flame colour with an emission at 670 nm.
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A: The bags are scanned for security, not specifically for lithium batteries. If you leave a lithium battery in your bag it will travel with you. It is safer for the battery to be in the cabin so that if a thermal runaway occurs the cabin crew can deal with it.
Spare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only. With airline approval, passengers may also carry up to two spare larger lithium ion batteries (101–160 Wh) or lithium metal batteries (2-8 grams).