Do I have to declare spare (loose) lithium batteries at United Kingdom customs?

Only above the allowance. Up to 2 devices there is nothing to declare; beyond it you take the goods through the red channel and pay the duty.

What happens if I do not declare spare (loose) lithium batteries in United Kingdom?

Under Travellers' Allowances Order 1994, if you declare the excess yourself: a flat-rate charge is applied to the excess. The normal duty becomes payable on the excess. Under Customs and Excise Management Act 1979, section 167, if it is treated as smuggling: it is prosecuted as a criminal offence; the goods are confiscated.

Do duty-free purchases count toward the United Kingdom allowance for spare (loose) lithium batteries?

Yes. What you buy in an arrival duty-free shop comes out of the same allowance, so the shop does not add to what you may already be carrying.

Can I post or ship spare (loose) lithium batteries to United Kingdom instead of carrying it?

Not under this allowance. It covers goods a traveller carries; a parcel is an import and is assessed under the postal rules instead. Baggage sent before or after you travels under the same allowance.

Can I take spare (loose) lithium batteries out of United Kingdom?

United Kingdom publishes no separate rule for taking spare (loose) lithium batteries out; the destination's rules are what will apply.

Can I carry spare (loose) lithium batteries in the cabin or in checked baggage?

In the cabin: Allowed with conditions. In checked baggage: Prohibited. The carriage limit is 100.0000 Wh / 2.0000 g lithium. This comes from International baseline, and an individual airline may be stricter. Customs and aviation are separate rulebooks: what an airline lets you carry is not what a border lets you bring in.

Does the United Kingdom limit for spare (loose) lithium batteries apply per person or per family?

Per person. Each traveller carries their own allowance and it cannot be pooled with anyone else's.

Where does this rule come from?

HM Revenue and Customs (HMRC) / Border Force states it in Items that are allowed in baggage. CarryRules last confirmed that sentence at the source on 2026-09-19. The sentence it rests on reads: “no more than two spare batteries batteries meeting the requirement of c) and d) may be carried per person;”

How does United Kingdom compare with other countries on spare (loose) lithium batteries?

Of the 20 countries covered here, 0 prohibit spare (loose) lithium batteries, 13 limit it and 7 let it through. United Kingdom is among the ones that set a limit.

How much Spare (loose) lithium batteries can I bring into United Kingdom?

Restricted

You can bring Spare (loose) lithium batteries into United Kingdom only within the stated limits.

Cabin baggage Allowed with conditions Source: International baseline

Checked baggage Prohibited Source: International baseline

Declaration Above allowance

Limit 2 device

What you need to know

2 device
Channels: Carried with the traveler

On the plane

International baseline

On person Not stated

Cabin baggage Allowed with conditions

Checked baggage Prohibited

Airline differences

Airline	Difference from the baseline
American Airlines	More permissive
All Nippon Airways	Stricter than the standard rule
British Airways	Stricter than the standard rule
Delta Air Lines	Stricter than the standard rule
easyJet	More permissive
Japan Airlines	More permissive
Korean Air	Stricter than the standard rule
Ryanair	Stricter than the standard rule
Turkish Airlines	Stricter than the standard rule

Important

This allowance applies per person, not per family or group.

Official sources

Last verified 2026-09-19

Items that are allowed in baggage UK Civil Aviation Authority

Questions about Spare (loose) lithium batteries in United Kingdom

How many spare (loose) lithium batteries can I bring into United Kingdom?: United Kingdom allows 2 devices per traveller. Above that the goods are treated as an import and duty becomes payable. The allowance is per traveller and cannot be pooled between people.
Do I have to declare spare (loose) lithium batteries at United Kingdom customs?: Only above the allowance. Up to 2 devices there is nothing to declare; beyond it you take the goods through the red channel and pay the duty.
What happens if I do not declare spare (loose) lithium batteries in United Kingdom?: Under Travellers' Allowances Order 1994, if you declare the excess yourself: a flat-rate charge is applied to the excess. The normal duty becomes payable on the excess. Under Customs and Excise Management Act 1979, section 167, if it is treated as smuggling: it is prosecuted as a criminal offence; the goods are confiscated.
Do duty-free purchases count toward the United Kingdom allowance for spare (loose) lithium batteries?: Yes. What you buy in an arrival duty-free shop comes out of the same allowance, so the shop does not add to what you may already be carrying.
Can I post or ship spare (loose) lithium batteries to United Kingdom instead of carrying it?: Not under this allowance. It covers goods a traveller carries; a parcel is an import and is assessed under the postal rules instead. Baggage sent before or after you travels under the same allowance.
Can I take spare (loose) lithium batteries out of United Kingdom?: United Kingdom publishes no separate rule for taking spare (loose) lithium batteries out; the destination's rules are what will apply.
Can I carry spare (loose) lithium batteries in the cabin or in checked baggage?: In the cabin: Allowed with conditions. In checked baggage: Prohibited. The carriage limit is 100.0000 Wh / 2.0000 g lithium. This comes from International baseline, and an individual airline may be stricter. Customs and aviation are separate rulebooks: what an airline lets you carry is not what a border lets you bring in.
Does the United Kingdom limit for spare (loose) lithium batteries apply per person or per family?: Per person. Each traveller carries their own allowance and it cannot be pooled with anyone else's.
Where does this rule come from?: HM Revenue and Customs (HMRC) / Border Force states it in Items that are allowed in baggage. CarryRules last confirmed that sentence at the source on 2026-09-19. The sentence it rests on reads: “no more than two spare batteries batteries meeting the requirement of c) and d) may be carried per person;”
How does United Kingdom compare with other countries on spare (loose) lithium batteries?: Of the 20 countries covered here, 0 prohibit spare (loose) lithium batteries, 13 limit it and 7 let it through. United Kingdom is among the ones that set a limit.

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