Household Batteries

AA and AAA describe battery sizes, but cells of the same size can use different chemistry and charging arrangements.

Shop the collection

Related reading

AA and AAA describe battery sizes, but cells of the same size can use different chemistry and charging arrangements. Compare the device's requirements with the battery label before choosing a disposable pack or a rechargeable option. A USB-rechargeable cell should not be treated as an ordinary cell for any charger.

Start with the device's required cell

Size, voltage and battery type all matter. This selection includes alkaline packs and USB-rechargeable lithium-ion AA and AAA cells, which use different charging arrangements. Follow the device and battery instructions rather than assuming every cell with the same outer shape is interchangeable.

Compare capacity using the right units

Capacity can be stated in mAh or mWh. These are different measures, so a larger printed number is not automatically a longer runtime. Compare like-for-like specifications at the relevant voltage, and treat runtime as dependent on the device and how it is used.

Store and recharge batteries appropriately

Use the charging method specified for the particular rechargeable battery; never recharge a disposable alkaline cell. Keep loose cells away from metal objects, and keep small batteries inaccessible to children. If you use several cells in one device, follow the manufacturer's guidance on matching their type and condition.

Further reading: Panasonic: rechargeable battery questions · Product Safety Australia: button battery safety

Useful answers

Household Batteries: practical questions

Can rechargeable AA batteries replace any disposable AA cells?

The physical size is only one part of the decision. Match voltage, chemistry and the device’s permitted battery types, then use the charging method specified for the rechargeable cell. USB-rechargeable lithium cells should not be assumed interchangeable with every AA charger or every device using AA-sized batteries.

Is a battery marked with more mWh always better than one marked in mAh?

Those units describe different measures, so compare them at the relevant voltage rather than comparing the printed numbers directly. Runtime also depends on the device and its use. Look for like-for-like specifications and avoid treating a larger number in a different unit as a longer-lasting battery.

How should I choose the charger for rechargeable household cells?

Use the charger or charging connection specified for the exact battery type. A compatible size does not establish compatible charging chemistry. Never try to recharge disposable alkaline cells, and store loose batteries away from metal objects and out of children’s reach.