CHARGING
Charge where you can see it
West Yorkshire Fire and Rescue says do not leave batteries charging unattended, for example while asleep or out, and unplug once they are full.
Check your batteryWHAT THE GUIDANCE SAYS
Warm kit,
safe battery.
Heated clothing is a battery you wear.
Check your battery
CHARGE WISELYthen wrap up warm
Heated jackets, gloves and socks carry small rechargeable lithium-ion packs. UK fire services and the national product regulator say the same few habits keep those batteries safe: the right charger, a watched charge and a quick check for damage.
At a glance
- Use the right charger
- Never charge unwatched
- Retire a swollen pack
- Small habits, safer warmth
100 Wh
Spare lithium-ion battery, cabin only
The CAA says spare lithium-ion batteries up to 100 Wh are allowed without approval from the airline, carried as carry-on baggage and individually protected against short circuits.
NO APPROVAL NEEDED · UK CAA
160 Wh
Upper limit for a spare battery
Spares above 100 Wh but not exceeding 160 Wh need the airline's approval, and no more than two such spares may be carried per person.
WITH AIRLINE APPROVAL · UK CAA
TWO NUMBERS WORTH KNOWING
Watt-hours decide
what can fly.
Lithium-ion batteries are regulated by their watt-hour rating,
which is often marked on the pack.
If only mAh is marked, the CAA explains: divide by 1000 to get Ah, then multiply by the nominal voltage (Ah x V = Wh). For example, 4400 mAh is 4.4 Ah.
A QUICK BATTERY CHECK
What is your
battery doing?
Pick a situation to see what UK safety guidance says about it. The bar shows how firmly the guidance warns.
Based on West Yorkshire Fire and Rescue Service, OPSS and UK Civil Aviation Authority guidance. This is general information, not personal safety advice.
THE SHORT ANSWER
Treat the pack
like any battery.
The heating panel is simple.
The guidance is all about the battery.
TRAVEL
Spare packs fly in the cabin
The Civil Aviation Authority says spare lithium batteries go in carry-on baggage only, each protected against short circuits.
See the limits
WARMTH
Warm hands and feet matter
For people with Raynaud's, the NHS advises warm clothes in cold weather, especially on hands and feet, and avoiding sudden changes in temperature.
Habits to try
FOUR HABITS TO TRY
Warmer days,
calmer charging.
None of these needs new kit. They come straight from UK fire service and product safety advice for anything with a lithium-ion battery.
Charge in the daytime
Charge where you can keep an eye on it, away from anything that burns, and unplug once full. Fire services advise working smoke alarms where you charge.
Keep the original charger
Use the manufacturer's recommended charger and replacement battery, bought from a reputable source. Do not modify or tamper with a battery.
Look before you plug in
Check the pack for swelling, cracks or a damaged case before charging. Keep it away from keys and coins in pockets and bags.
Recycle, do not bin
Do not put batteries in household waste. Take old packs to a battery collection point at a supermarket or a local recycling centre.
WHY IT MATTERS
Small packs,
real fires.
West Yorkshire Fire and Rescue says the number of fires caused by lithium-ion batteries has increased in recent years, and that these fires are ferocious, spread quickly and give off highly toxic smoke.
Its advice if one does catch fire is short: get out, stay out, call 999. It also warns against storing or charging batteries at very hot or very cold temperatures.
Questions
Questions people ask
Is it safe to charge heated clothing batteries overnight?
UK fire service guidance says not to leave charging items unattended, for example while you are asleep or away from home, and to unplug chargers once batteries are full.
Can I use any USB charger or a cheaper replacement?
OPSS says not all batteries and chargers are compatible or safe when used together. It advises using only the manufacturer's recommended battery or charger, bought from a known seller.
Can I take a heated jacket battery on a plane?
The CAA says spare lithium-ion batteries must go in carry-on baggage, protected against short circuits. Up to 100 Wh needs no airline approval; 100 to 160 Wh needs approval. Check with your airline.
What should I do with a swollen battery?
Stop using it. Fire service guidance says not to use batteries that appear swollen or deformed, and not to put batteries in household waste: take them to a collection point.
Who might find heated gloves or socks useful?
The NHS advises people with Raynaud's to wear warm clothes in cold weather, especially on hands and feet. It does not name heated clothing; ask a GP about your own situation.
Sources
Where the facts come from
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