LiPos › Flying with LiPo and lithium batteries (UK CAA guidance)
Flying with LiPo and lithium batteries (UK CAA guidance)
Spare lithium batteries belong in the cabin, not the hold. Here is what the UK Civil Aviation Authority says, including the watt-hour limits.
Spare batteries go in the cabin
The CAA says spare batteries should be carried in the cabin and protected from damage. Never pack them in checked luggage, because they can overheat and cause a fire. Batteries that are damaged, overheating or swelling should not be used or carried on a plane.
Watt-hour limits
| Battery size | CAA guidance (if your airline uses Wh limits) |
|---|---|
| Under 100 Wh | Common in phones, laptops and cameras. Carry in the cabin. |
| 100 Wh to 160 Wh | Common in power tools and large power banks. Needs airline approval. |
| Over 160 Wh | Not allowed in passenger baggage. Must travel as dangerous goods cargo. |
If the Wh rating is not printed on the battery, work it out: volts × amp-hours = Wh, or (volts × mAh) ÷ 1000 = Wh. A typical 3S 2200 mAh LiPo is about 24 Wh; see ratings explained. Most hobby packs are well under 100 Wh, but check each one.
Power banks and vapes
The CAA's Pack Right page says power banks and vapes go in the cabin. You may carry two power banks per person, must not recharge them on board or charge them during any flight, and may be asked to keep them in the seat-back pocket instead of the overhead locker. Check your airline's own rule before you travel; airlines can be stricter.
Devices that contain batteries
Phones, tablets and laptops should normally stay in the cabin unless completely turned off and protected from damage. If your cabin bag is taken to be put in the hold at the gate, remove any batteries or lithium-powered devices first.
Drones and RC models
The CAA Pack Right page does not cover drones specifically, so we can't tell you what the CAA says about them. Check with your airline before you travel, give it the battery watt-hours and cell count, and ask whether there is a limit on the number of spare batteries. Tips from pilots include:
- Carry the batteries in your hand luggage, in a protective case or bag, with the terminals covered.
- Discharge or store at a safe level if the airline asks. Some do. Ask.
- Keep each pack in a separate sleeve so terminals can't touch each other or metal.
- Bring the manufacturer's spec sheet or a photo of the label showing Wh.
These are common practice rather than official rules, so rely on your airline's written policy.
UK drone registration is a separate matter
The CAA's drone rules are about registration and flying, not the batteries. The CAA says drones or model aircraft of 250 g to under 25 kg need a Flyer ID and an Operator ID. See RC, drone and FPV use.
Before you go
- Check the Wh rating of each battery.
- Read your airline's policy.
- Pack batteries in the cabin, protected from shorting and damage.
- Do not fly with damaged or swollen packs.
Rules can change. The CAA page lives at caa.co.uk/packright. See the LiPo guide home for other topics.
This is general information, not a substitute for the instructions that came with your battery and charger. If your manufacturer's advice differs, follow the manufacturer.
Frequently asked questions
Can I take LiPo batteries in hand luggage?
Spare lithium batteries should go in the cabin, protected from damage, and never in checked luggage. Check your airline's policy.
What is the 100Wh limit?
Under 100 Wh is common for phones and laptops. From 100 to 160 Wh needs airline approval, and over 160 Wh is not allowed in passenger baggage, per the CAA.
How many power banks can I carry?
The CAA says two per person, in the cabin.
Can I take a drone on a plane?
The CAA page does not cover drones, so ask your airline.