Shipping Batteries and Chemical Liquids: What You Need to Know
Battery shipping regulations and chemical shipping restrictions catch most resellers off guard on their first dangerous goods shipment, usually because nothing about the product looks dangerous sitting on a shelf. A power bank is just a power bank. A bottle of setting spray is just setting spray. Freight forwarders see them differently, and knowing the difference before you book a shipment saves you a held parcel and a frustrating email chain.
This covers what actually makes these goods subject to special rules, how the rules shift between air and sea, and what to have ready before you ship either category for the first time.
Why certain goods are classified as dangerous
"Dangerous goods" (DG, sometimes called hazmat) is a formal freight classification, not a judgement on how risky the product feels in everyday use. It applies to anything that could pose a risk in transit through fire, chemical reaction, leakage, or pressure change.
Batteries and liquids land on the list for specific, physical reasons. Lithium batteries can overheat and ignite under certain conditions. Flammable or corrosive liquids can leak, react with other cargo, or become unstable under pressure. None of this reflects how safely you'd use the product at home. It reflects what can happen at altitude, in a pressurised cargo hold, or if a parcel gets crushed or punctured in transit.
Shipping batteries: what the rules actually say
Lithium vs alkaline batteries
Battery shipping regulations only bite for lithium batteries, both lithium-ion and lithium metal. Standard alkaline batteries (AA, AAA, and similar) don't carry the same restrictions.
Lithium battery shipping covers a wider range of everyday reseller stock than most people expect: phone batteries, laptop batteries, power banks, and anything else that's rechargeable.
Air vs sea freight for lithium batteries
Always declare battery-containing goods when you book a shipment. Undeclared batteries are the single most common reason a parcel gets rejected or held.
For most lithium shipments, you'll need an MSDS, a UN 38.3 test certificate, and correct outer packaging labels. There's a practical exception worth knowing: certain battery-containing items, typically capped at two pieces per parcel (sometimes per airway bill), can be accepted without an MSDS. Most mobile phones, earphones, laptops, and tablets fall into this category under IATA guidelines. It's a narrow allowance, not a blanket exemption, so confirm the exact limit with your freight forwarder before assuming your shipment qualifies.
Youth and trend-driven
Mixxmix, Chuu, and Stylenanda are higher-turnover stock. K-pop-adjacent aesthetics, strong TikTok presence, repeat buyers. The trade-off is more frequent restocking and markdown risk if you hold too much of a single style.
Shipping chemical liquids: what counts and what to prepare
Which liquids trigger restrictions
Chemical shipping restrictions apply to a longer list of everyday reseller products than most people assume:
- Perfumes and colognes: alcohol-based, flammable
- Nail polish and remover: acetone-based, highly flammable
- Aerosol sprays: deodorant, dry shampoo, spray paint
- Cleaning products: anything containing bleach, ammonia, or acids
- Certain chemical beauty treatments: check the active ingredients before shipping
- Essential oils at high concentrations: volume and concentration both matter
Most water-based toners, non-alcoholic serums, and similar liquids with no hazardous classification ship as standard cargo without any of this.
Packaging and documentation for liquids
Shipping chemical liquids safely means a leak-proof primary container, sealed secondary packaging, and a sturdy outer box with absorbent material in case of a leak. An MSDS is mandatory for most regulated liquids, and some also require a shipper's dangerous goods declaration.
Flammable liquids above a certain quantity can't travel by air at all, regardless of how well they're packaged. Sea is the only viable route once you're past that threshold.
| Air Freight | Sea Freight | |
|---|---|---|
| Lithium Batteries | Class 9 DG, watt-hour limits, stricter documentation | Governed by IMDG, more permissive on quantity and watt-hours |
| Regulated Liquids | Flammables restricted or banned above certain volumes | Generally more permissive, subject to packaging rules |
| Documentation | MSDS, UN 38.3 (batteries), DG declaration | MSDS, DG declaration where applicable |
| Speed | Faster | Slower |
The general principle holds across both categories: sea freight is more permissive for DG goods but slower. Air is viable for smaller quantities when the paperwork and packaging are in order.
Shipping DG items with Com&Buy
If you're using the Ship For Me service for battery or liquid stock, declare the goods correctly at booking: product name, battery type if applicable, whether the liquid is regulated, and declared value. Leaving any of this out is what usually causes a hold further down the line.
Submit the MSDS to the Com&Buy team before the parcel arrives at the warehouse, or as soon as it does. If you're not sure whether a product counts as dangerous goods, ask before you place the order rather than after the parcel is already in transit. For more on what an MSDS actually is and when you need one, see our companion article on MSDS documentation.
Regulations are subject to change. Verify all requirements against the relevant government sources before placing orders.
Ready to ship batteries or regulated liquids?
Get in touch with the Com&Buy team before you book, and we'll confirm exactly what documentation your shipment needs. Set up an account at comnbuy.com, or reach the team on WhatsApp at +65 8770 0887. As a shipping forwarder in Singapore, we handle the declaration and documentation side so your restock doesn't get held over a missing form.
FAQs
Why are lithium batteries hard to ship?
Lithium batteries carry a Class 9 dangerous goods classification because of fire risk. That triggers packaging, labelling, and documentation requirements that alkaline batteries never face. Air freight applies the strictest limits; sea freight is generally more forgiving on quantity and watt-hours.
What is the best way to ship liquids internationally?
Non-hazardous liquids move as standard cargo with no extra steps. Regulated liquids like perfumes, flammables, and aerosols ship more easily by sea than by air. Either way, the baseline is the same: leak-proof containment packaging and an MSDS.
Do I need to declare batteries inside electronics?
Yes, always. Undeclared batteries inside devices, not just loose ones, are one of the most common causes of shipment rejection.