If you sell electronics, power banks, or anything with a rechargeable battery in it, you've almost certainly hit the wall of lithium battery shipping rules at some point. They're genuinely restrictive, they differ by carrier, and getting them wrong isn't just a returned parcel, it's a potential safety issue that carriers take seriously. The good news is the rules are learnable, and once you know the categories, most small electronics fall into a sendable bucket.
Why lithium batteries are treated differently
Lithium batteries can overheat and catch fire if damaged or short-circuited, which is why every carrier restricts them. The risk isn't about your battery specifically, it's about what happens in a sorting facility or aircraft hold if a parcel gets crushed. The rules exist to keep an unlikely but serious event from turning into a fire, and they're enforced more strictly than almost anything else in shipping.
The categories that matter
The rules split into three rough buckets. Lithium ion and lithium metal are treated separately, and each is then divided by whether the battery is packed with the device, installed inside it, or sent loose on its own. Loose batteries are the most restricted, batteries installed in equipment are usually the easiest to send, and batteries packed alongside a device sit somewhere in the middle.
Royal Mail's position
Royal Mail prohibits loose lithium batteries outright in most cases and restricts equipment containing them. New devices with the battery installed and properly packed are generally sendable within the UK, but power banks and spare batteries are often a no. The exact list changes, so check Royal Mail's current prohibited and restricted items before you list, and don't rely on a blog post from last year. Our prohibited items guide points you at the right place to check.
Courier positions vary
Couriers aren't uniform. Some accept lithium batteries within limits that Royal Mail rejects, others are stricter. DPD, Evri and UPS each publish their own dangerous goods policy, and it's worth reading the one for the carrier you actually use, because what one accepts another will refuse at the door. When in doubt, phone them, because a refused parcel is cheaper than a fine or a safety incident.
Labelling and packaging requirements
Where batteries are allowed, packaging and labelling matter. Batteries need to be protected from short circuits, terminals taped or in their original packaging, and the parcel may need a lithium battery handling label and a UN number. The specifics depend on the carrier and the battery size, so this is one area where guessing is genuinely dangerous, follow the carrier's published instructions exactly.
The paperwork side
For international shipments, lithium batteries add dangerous goods declarations and, for air freight, stricter documentation still. Sending a battery-powered device abroad is a different task from sending it within the UK, and the paperwork is non-negotiable. If international battery shipping is part of your business, it's worth the time to learn the IATA rules properly rather than improvising per parcel.
What this means for your listings
The practical takeaway is to know your product before you list it. If you sell a device with a battery installed, confirm it's sendable and note the carrier you'll use. If you sell spare batteries or power banks, check whether your chosen carrier will even take them, and price the postage accordingly. Sellers who work this out up front avoid the awkward discovery that they can't actually ship what they've just sold.
Getting the label and the handling right
Once you've confirmed a battery is sendable and packed it correctly, the label is the easy part. The postage prints as a standard 100 × 150mm label like anything else, and the additional battery handling label goes alongside it. A clean thermal print keeps the main barcode scannable, which matters doubly on a parcel that's already under extra scrutiny.
Frequently asked questions
Can I send lithium batteries with Royal Mail? Loose lithium batteries are generally prohibited. New devices with the battery installed are often sendable within the UK, but check Royal Mail's current restrictions first.
Are power banks allowed in the post? Power banks are usually treated as loose lithium batteries and are restricted or prohibited by many carriers, so check your carrier's policy before selling them.
Do I need a label for lithium battery parcels? Where allowed, parcels often need a lithium battery handling label and correct packaging in addition to the standard shipping label.
Labels that hold up under scrutiny
Battery shipments already get extra checks, so give them a clean 100 × 150mm direct thermal label with a barcode that scans first time, every time.
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