Cordless battery and charger stored safely at home

Battery Storage Safety at Home: Where, How and What to Avoid

Store household batteries in a cool, dry spot away from sunlight, heat and anything flammable. Charge them on a hard, clear surface with the charger that came with the device. Stop using any battery that is cracked, swollen, leaking or smells odd. Most home battery trouble comes from a few avoidable habits, and this guide covers each one, from AA cells in a kitchen drawer to the e-bike charging in your garage.

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TL;DR

  • Keep batteries at room temperature, dry, and out of direct sun. Lithium-ion batteries should not be charged below 32°F (0°C) or above 105°F (40°C).
  • Use only the charger, cord and battery made for your device, and plug it straight into a wall outlet, not a power strip.
  • Check batteries for cracks, swelling, leaks, odd smells or noises. If you see any, stop using them and move them away from flammable items.
  • Never put lithium-ion batteries in household trash or recycling bins. Take them to a hazardous waste or battery recycling drop-off.
  • For long storage, keep lithium-ion batteries at about 50% charge and check them every three months.

Table of Contents

Why battery storage deserves a plan

Lithium-ion batteries power phones, power tools, e-bikes, cordless inflators and portable warmers. They hold a lot of energy in a small case. When one is damaged, overcharged or overheated, it can go into thermal runaway. The U.S. Fire Administration says that overcharging can cause overheating, and thermal runaway can lead to fire or explosion. These fires can also reignite after they look out.

NFPA lists four common starting points: physical damage, electrical damage such as overcharging or mismatched chargers, extreme temperatures and product defects. Good storage and charging habits address all four.

Four common causes of lithium battery fires

Where to store batteries

The rule is the same across agencies. New York’s state emergency services division advises storing batteries and devices in a cool, dry place away from direct sunlight and extreme temperatures. Massachusetts adds that lithium-ion batteries should be kept away from combustible materials.

In practice, that means:

  • Good spots: a closet shelf, a plastic or metal bin in a hall cabinet, or a drawer away from the stove.
  • Poor spots: a hot car, a sunny windowsill, an uninsulated attic, or a shelf in the garage piled with paint, gasoline cans or cardboard.
  • Garage storage: garages swing hot and cold, so a metal shelf or cabinet on an interior wall, clear of fuel and clutter, is better than an open bench. Our garage storage and shelving range is built for this kind of job.

Lithium-ion battery storage temperature

For lithium-ion batteries, the U.S. Fire Administration says to store them at room temperature and not to charge them below 32°F (0°C) or above 105°F (40°C). The Canadian National Research Council adds a useful habit: a battery that has been sitting hot or cold should reach room temperature before you start charging it. So if a power tool battery spent the night in an unheated shed in January, bring it inside and let it warm up first.

Cold cordless battery left indoors before charging

Storing batteries for months

If a battery will sit unused, Health Canada says lithium-ion batteries should be kept at about a 50% charge and checked every three months. That applies to the seasonal pack for a leaf blower, a pool tool or a cordless drill. Do not leave one fully drained or sitting on a charger all winter.

Storing AA and AAA batteries

Disposable AA and AAA cells carry less risk than a large lithium pack, but the basics still apply: cool, dry, room temperature. Some habits that help:

  • Keep them in the original packaging or a plastic organizer, so the metal ends cannot touch each other or loose coins, keys or foil.
  • Do not mix old and new cells, or different brands, in one device.
  • Take batteries out of devices you will not use for a long time, such as holiday decorations or seasonal remotes, to avoid leaks.
  • Do not keep loose batteries in a junk drawer with metal objects.

If you find a leaking cell, wear gloves, wipe the residue away from your skin and eyes, and dispose of the battery as hazardous waste rather than in the trash.

Setting up a battery charging station

A dedicated charging spot makes safe habits automatic. The National Research Council Canada recommends a dedicated charging area that is clear of flammables, protected from physical hazards and has emergency gear within reach.

Here is a simple setup:

  1. Pick the surface. For e-bikes, e-scooters and hoverboards, New York advises charging in a flat, dry area away from children, sunlight, liquids, tripping hazards and risk of falling. A concrete garage floor or a metal-topped bench works well.
  2. Clear the area. Move paper, rags, solvents, fuel and cardboard away from the charger.
  3. Use the right gear. Massachusetts says to use only the battery, power adapter and cord provided by the manufacturer for your device.
  4. Plug into the wall. New York advises plugging chargers directly into a wall outlet, not a power strip, and never overloading an outlet.
  5. Stay nearby. Do not charge phones or small devices under pillows or on beds and couches, and avoid charging while you sleep or are out.
  6. Keep a smoke alarm close and know where your exit is.

When you buy, look for devices listed by a nationally recognized testing laboratory such as UL. Our guide on why cheap gadgets fail early explains what to check before you trust any budget device.

Warning signs of a failing battery

Massachusetts tells users to stop using a battery that is damaged or shows an unusual odor, a change in color or shape, leaking or odd noises. Look for swelling, hot spots, hissing and a case that no longer sits flat.

If you see any of these, take these steps:

If a lithium-ion battery does catch fire, leave the area and call 911. NFPA notes that water is an effective extinguishing medium for lithium-ion batteries, because they contain lithium salts rather than pure lithium metal. The fire can include heat, smoke, toxic gases and possible explosion, so do not stay to fight a large one.

Getting rid of old batteries

Dead or damaged batteries are a fire risk too. Massachusetts says never to put lithium-ion batteries in household trash or recycling bins, since they can start fires in trucks and facilities. The EPA also points out that the chasing arrows symbol means recyclable at specialized facilities, not in your curbside bin.

Before you drop batteries off, the EPA advises you to tape the terminals with electrical tape or bag each battery separately to prevent short circuits. For bulky items with built-in batteries, such as old electronics or tools, read through these e-waste disposal options for household items to find the right route.

Our perspective

We have sold home, yard and garage products for 15 years, and most of the battery questions we hear come from the same places: a garage shelf, a tool bench and a kitchen drawer. Our view is simple. Safe battery use is mostly about where the battery lives and what it plugs into, not about spending more. A clean shelf, the charger that shipped with the device and a monthly glance for swelling or leaks cost almost nothing.

We vet products before listing them, and we still suggest you read the label on anything you charge. Check for the manufacturer’s charger, keep the packaging manual and set aside one clear corner for charging. If a battery looks wrong, trust your eyes and stop using it.

— Thane Holland

Battery-powered gear that fits a safe setup

If you are replacing a device, choose one with a clear battery rating and a charging cable included. At PriceLows™ you can find a cordless car tire inflator with a 5200mAh battery for the trunk and a rechargeable COB work light for the workbench. Most orders ship free, and our 100% Shipping Protection covers your purchase in transit. Browse everything at PriceLows™.

Self Heating Lunch Box | 1.2L Capacity | 20000mAh Battery | Cordless Portable

FAQ

Is it safe to store lithium-ion batteries in a garage?

Only if the garage stays within reasonable temperatures and the batteries are away from fuel, paint and clutter. Fire agencies advise room temperature, so a garage that gets very hot or freezing is a poor choice. An interior shelf or a metal cabinet is better than an open bench.

Can I leave a battery on the charger overnight?

It is better not to. Overcharging can cause overheating, and a problem is hardest to catch when no one is awake or at home. Charge while you are nearby, unplug when done and follow the device maker’s instructions.

How should I store AA batteries?

Keep them in the original package or a plastic organizer at room temperature, dry and out of sunlight. Prevent the metal ends from touching other metal. Remove them from devices you will not use for a while.

What temperature should I avoid when charging lithium-ion batteries?

Do not charge them below 32°F (0°C) or above 105°F (40°C), according to the U.S. Fire Administration. If a battery is very cold or hot, let it reach room temperature first.

Sources

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