Meta title: Transporting Power Tool Batteries Safely in the UK | Lithium-Ion Battery Van Storage Guide
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If you drive a van loaded with power tools, you transport lithium-ion batteries every working day. Most of the time you do it without thinking about it at all, and most of the time the risk is minimal. But there are specific conditions where how you store and transport batteries matters — and understanding the rules protects your safety and your legal position.
This guide draws on Makita UK's published battery transportation guidance and the UK rules that apply to lithium-ion batteries in road and air transport.
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Why lithium-ion batteries need careful handling
Lithium-ion cells store a significant amount of energy in a compact package. That is exactly what makes 18-volt and 40-volt power tools so practical on site. But a lithium-ion battery that is physically damaged, short-circuited, or exposed to prolonged extreme heat can enter a condition called thermal runaway. The cell temperature rises quickly, generating heat and gas, and in serious cases fire.
This does not happen often in normal trade use — it is genuinely rare. But because the consequences can be serious, there are rules around transporting lithium batteries, particularly in large quantities and particularly by air.
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Van storage: the practical rules for road transport
For tradespeople transporting a working load of power tool batteries in a van, the relevant framework is UK road transport law and the Health and Safety Executive guidance on battery handling. For personal and trade quantities of batteries in tools or as spares, the rules are straightforward:
Protect the terminals. A loose battery rolling around in a bag where the positive terminal can contact a screw, a metal tool housing, or any other conductive surface can short circuit and generate heat. Keep batteries in the tool, in their original packaging, or with the terminals covered with insulating tape if carrying spares loose.
Store away from combustibles. Batteries should be kept away from materials that can catch fire easily. In a van, this means not stacking loose batteries alongside solvent-based products, aerosol cans, oily rags, or accumulated sawdust. A hard-sided storage system — PACKOUT, Toughstak, or equivalent — away from combustible stock is the practical approach.
Check damaged batteries before loading. A battery that has been dropped from height, crushed, punctured, or has visible casing deformation should not be transported until you have assessed it. If it is warm to the touch or the casing is swollen, contact the manufacturer. Both Makita UK and Milwaukee UK have guidance on returning suspect batteries. Damaged lithium-ion cells should go through proper battery recycling rather than in general waste.
Do not charge unattended in the van. Charging in a parked van is common practice and broadly acceptable. The precaution is not to leave batteries charging unattended for extended periods, and not to charge while driving — both add risk in a confined space without you being present to respond if something changes.
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Working out whether your batteries are affected by restrictions
For road transport of commercial quantities and for all air travel, lithium-ion batteries are classified by their energy content, which is measured in Watt-hours (Wh).
The calculation is straightforward: Voltage multiplied by Amp-hours gives Watt-hours.
Here is how the most common trade battery sizes work out:
- 18V x 2.0Ah = 36Wh — roughly the energy used by a 40-watt bulb for 54 minutes
- 18V x 5.0Ah = 90Wh — about the energy stored in a large laptop battery
- 18V x 6.0Ah = 108Wh — above the 100Wh airline cabin threshold
- 18V x 9.0Ah = 162Wh — above the 160Wh airline threshold
- 40V x 4.0Ah = 160Wh — at the boundary of airline restrictions
- 40V x 5.0Ah = 200Wh — above standard airline limits
For van and road use at typical trade quantities (a dozen batteries of mixed sizes), UK road transport rules apply general exemptions for dangerous goods in small quantities. The regulations become more significant if you are transporting large commercial volumes — for example if you supply or distribute power tools as part of your business.
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Taking power tool batteries on a plane
If you travel to job sites by air — relevant for tradespeople working across the UK, in Ireland, or internationally — battery size directly affects what you can carry.
Under 100Wh: Allowed in cabin baggage without advance permission from the airline. This covers 18-volt batteries up to approximately 5.5Ah, and most 12-volt tool batteries.
100Wh to 160Wh: Generally allowed in cabin baggage, but airlines can limit you to two batteries and some require advance notification. This range covers 18V 6.0Ah through to 18V 9.0Ah packs, and 40V batteries up to 4.0Ah.
Over 160Wh: Cannot be carried in cabin baggage under standard rules. Checked baggage carriage requires specific airline approval and is limited to two batteries on most carriers. This applies to 18V 12.0Ah packs and 40V packs above 4.0Ah.
The rules are set by the International Air Transport Association (IATA) and applied by individual airlines. The classification is based on energy content, not voltage — a 40V 5.0Ah battery (200Wh) is restricted in the same way as any other 200Wh battery regardless of the voltage it runs at.
Always check with your carrier before travelling. The simplest approach for air travel with tools is to plan around batteries that fall below 100Wh and make arrangements for higher-capacity packs to travel separately or be sourced at the destination.
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What Makita UK's guidance covers
Makita UK publishes specific documentation on transporting lithium-ion batteries, addressing the legal framework in practical terms for tradespeople. The guidance covers both road and air transport scenarios and is written around the battery sizes used in their professional tool range.
The consistent message from tool manufacturers including Makita, Milwaukee, and others: transport batteries in the tool or in original packaging with terminals protected, keep them away from heat and physical damage, and do not pack multiple loose batteries where the terminals can contact each other.
Makita UK battery transportation guidance: makitauk.com battery transport documentation
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Long-term battery storage
If you are putting seasonal tools away for extended periods — garden equipment, roofing tools, anything that only sees regular use for part of the year — storage matters as much as transport.
Lithium-ion cells degrade fastest when stored fully charged or fully depleted. The recommended storage level is around 50 per cent charge — not flat, not topped off. That is typically around two to three indicator lights on a battery with a charge level display, or the equivalent for batteries with a single charge indicator.
Storage conditions: cool, dry, away from direct sunlight and away from potential heat sources. Do not leave batteries in a van that sits in direct sun through a British summer — on a hot day the interior of a parked van can reach temperatures that accelerate cell degradation significantly even if you never notice a problem immediately.
Most professional tool manufacturers recommend checking batteries stored for longer than a month, partially recharging if necessary to keep them above the minimum level, and inspecting for any casing deformation before returning to use.
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