Flight to the US: replacement Li-Ion battery

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Accepted answer

As you are travelling on Lufthansa, Google's answer for "lufthansa battery policy" points to:

http://www.lufthansa.com/mediapool/pdf/74/media_1070298774.pdf

Which states:

Portable electronic devices with lithium

Description: portable electronic devices containing lithium-metal or lithium-ion cells or batteries, e.g. watches, calculators, cameras, mobile phones, laptop computers, camcorders, etc., when these are intended for personal use.

  • Checked baggage: Yes
  • Carry-on baggage: Yes
  • Carrier’s approval required: No

Rules for spare batteries:

  • Spare lithium-metal or lithium-ion cells or batteries with a nominal energy of up to 100 Wh for these everyday objects:
    • may only be carried in carry-on baggage and for personal use
    • these batteries must be individually secured against short circuit.
  • Each installed battery or spare battery may not exceed the following values:

    • lithium-metal or batteries with lithium alloy with a lithium content of 2 g, or
    • for lithium-ion batteries a nominal energy of 100 Wh.
  • Spare lithium-ion batteries for the above-named everyday objects with a nominal energy between 100 and 160 Wh:

    • maximum of two spare batteries per person
    • only permitted in carry-on baggage
    • each battery must be secured individually against short circuit
    • the carrier’s approval is required

No mention of a requirement to turn on the laptop. But don't forget to either wrap each space battery individually, or add a bit of tape on the contact to avoid any unwanted short-circuit.

Nowadays, the problem with batteries is more that they tend to burn/explode than the risk of someone placing explosives instead (I believe this would be detected by current generation luggage scanners).

Note also that:

  • even though you may encounter random secondary security checks at the gate for some flights (including to the US), security checks are usually common to all destinations
  • most airlines apply the IATA rules about Lithium batteries
  • in my experience, I've never been asked to turn on a laptop in at least 10 years
  • I've carried quite a lot of spare batteries in hand luggage, and nobody ever raised an eyebrow

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