Quick answer: How to store lithium batteries at home: dry, shaded, clear of your escape route and of anything flammable, and somewhere you would see, hear or smell a fault. Keep packs off the charger but not flat, look them over regularly for damage, and never keep a damaged pack inside.
Where should you keep a lithium battery at home?
A battery from an e-bike, scooter or board holds a lot of energy in a small space. Government advice therefore treats where it rests as seriously as how it charges, whether the pack lifts out, as on many adult e-bikes, or stays inside the vehicle.
The guidance from the DfT and from OPSS, the product safety regulator, boils down to five questions. Put them to any spot you have in mind:
| Ask | Why it matters | Rules out |
|---|---|---|
| Is it dry? | Damp is on the DfT's list of conditions to avoid, charging above all | Leaky sheds, damp cellars, walls that run with condensation |
| Could it block your escape? | A fire there could trap you; both DfT and OPSS rule out escape routes | Hallways, stairs, landings, shared corridors in flats |
| Is it shaded and away from heat? | Batteries should be kept from extreme temperatures, and shaded when idle | Windowsills, conservatories, radiators, the boiler cupboard |
| Is anything flammable close by? | The DfT advises against keeping batteries near combustible or flammable materials | Shelves of paper, cardboard boxes, fuel cans, paint, bedding |
| Would you notice a problem? | Heat, swelling, noise and smell are the warnings, and you only act on what reaches you; an alarm covers the rest | The loft, a cupboard nobody opens, a corner no alarm reaches |
A spot that passes all five could be a dry spare room covered by a working smoke alarm, with the pack standing on tiles or a metal shelf.
Is a shed or garage a better place for a battery?
Sometimes. DfT guidance suggests an outbuilding set apart from your home where possible, so that a fault would develop away from where people sleep. The same advice warns off spots that turn hot, freezing or damp, and a shed can manage all three in one year. If you use one, give it a heat alarm (the kind fire services recommend for garages), set the pack on a dry shelf above the floor, and keep anything flammable well away from it.
How should you store a battery you are not using?
- Off the charger. Disconnect it when full; OPSS also says the charger itself should be kept somewhere cool.
- Not empty. Left flat for months, a pack can fall so low it will no longer take a charge. A storage level belongs in the manual; we give none, as packs differ.
- Undamaged. A pack that took a hard fall, got crushed or was soaked does not belong in storage at all (see below).
- Paired. Keep every charger with the battery it came with, and mark which is which when the household runs more than one vehicle.
- As the maker says. Follow the storage instructions; if they are missing, OPSS suggests the maker's website.
What does a check on a stored battery involve?
DfT guidance is to check a battery regularly for any sign of damage. A look-round covers five points:
- Look at the case from every side: bulges, splits, a lid that has lifted, a lump or a leak.
- Touch it. A pack that nothing has used or charged should feel as cool as the room around it.
- Listen and sniff up close: no hissing, no cracking, no odd smell.
- Read the charge display, if there is one, and top the pack up during waking hours if the level is low.
- Press the test button on the nearest alarm.
Any of the first three signs turns a storage question into a safety one: read the signs of a pack starting to fail and act on them.
What changes from one vehicle to another?
E-bikes. On many models the pack comes off with a key, so the battery can come indoors while the bike stays outside. That is the easy case, and the routine above applies as written. For how a resting pack ages and what a replacement must match, see the lifespan of an e-bike pack.
E-scooters. On most models, scooters built for rough ground among them, the battery lives in the deck or stem, which means you store the whole machine. Fold it, stand it somewhere that answers the five questions, and look the deck over after any drop or hard knock.
Electric skateboards. The pack sits in a housing beneath the deck. Store the board flat or on its side on a solid floor, and check that housing after a hard landing as well as the top of the board, on off-road electric skateboards in particular.
Single-wheel boards and electric unicycles. Here the cells sit within the shell, close to the wheel, where a fall can reach them. Inspect the shell after any heavy fall before your electric unicycle or board goes into storage.
Hoverboards. Here the battery is wired inside and stays put. Our guide to laying up a hoverboard for the cold months covers that case.
Do you need a battery storage box?
Boxes and bags are sold for e-bike packs, often with claims about containing a fire. We have no test results for any of them, and none of the government guidance we checked asks you to use one. A box leaves the five questions unchanged, and the box itself has to stand somewhere that passes them.
What if a stored battery is damaged?
A dropped or crushed pack, or one with a split case, should not go back on the shelf; DfT advice is to replace a damaged battery rather than charge or use it. If it shows warning signs but is not smoking, switch off any charger. Then, provided that is possible without risk to you, move it outdoors onto paving or bare ground, at a distance from people and pets and from anything flammable, and ring whoever made or sold it for instructions. A dead or damaged pack never goes into household rubbish or recycling collections: ask the seller whether it takes old packs back, or your council about collection, and read where worn-out electricals and batteries go.
Take it out of storage
Do not charge a stored pack or ride with it, and get advice from whoever made or sold it, if:
- the case has bulged, split or come apart along a join;
- it feels warm although nothing has used or charged it;
- it starts to hiss, crackle or smell strange;
- it was dropped, crushed or soaked before it went away.
- If it smokes, a fire has begun: warn everyone, get out and call 999.
In Great Britain, an e-bike can be ridden like a pedal bike – on roads and cycle paths, without a licence, registration, tax or insurance – only if it is an electrically assisted pedal cycle (EAPC): it has pedals that drive it, its motor has a continuous rated power of no more than 250 W, and the motor stops assisting above 15.5 mph (25 km/h). You must be 14 or over to ride one on the road, and no e-bike may be ridden on the pavement.
Questions riders ask
Can I keep lithium batteries in the loft?
It is a poor choice. A loft can turn very hot in summer and very cold in winter, and the DfT advises against both. Nobody would see, hear or smell a problem up there either. A dry room you use every day is far easier to watch.
Where do I keep a damaged battery until it can be collected?
Outdoors, if it is not smoking: on bare ground or paving, apart from people and pets. Then ask the maker, the retailer or your council how to hand it in. Keep it out of the bin and out of the car.
Do tool and laptop batteries need the same care?
The same habits help: dry, shaded, clear of exits and of things that burn, and never kept once damaged. Follow each maker's own instructions as well; the advice here is aimed at the larger packs inside e-bikes, scooters and electric boards.
Can I leave a stored battery on the charger to keep it topped up?
No. OPSS says to unplug when charging has finished, and the DfT warns against overcharging. If a stored pack has dropped low, top it up in daytime hours while you are around, then unplug it again.