How to choose batteries: size, voltage and rechargeables

To choose a battery, look at three things on the device: size (AA, AAA, C, D, 9 V transistor), voltage and type. Alkaline batteries are fine for torches, remote controls and instruments that are used little; for devices used every day, a 1.2 V rechargeable battery with a suitable charger is the better choice. Lithium coin cells (3 V) are used in remote controls, car keys and small devices. Never mix new and used batteries.

The types

• AA and AAA alkaline batteries: the most common sizes, 1.5 V, for torches, measuring instruments and remote controls, such as the longlife MAX power AA battery and the AAA version.
• D and C batteries: larger, for torches and devices that draw more current.
• Flat and transistor batteries: 4.5 V (flat) and 9 V (transistor), for measuring instruments and dedicated devices. You will find the longlife power flat battery.
• Alkaline mini batteries: such as the MN11 and the MN21, in 6 and 12 V versions, for car and gate remote controls.
• Lithium coin cells: 3 V, for cameras, small devices and remote controls.
• Rechargeables and chargers: pre-charged Ready To Use rechargeable batteries, 1.2 V, and chargers such as the Pocket with 4 AA, the empty Pocket and the Universal.

How to choose by job

The features to look at

Size. It must be the one marked on the device: AAA, AA, C, D, flat, transistor. A different size will not fit in the compartment or will not make contact.

Voltage (V). In the collection: 1.2 V (rechargeable), 1.5 V (alkaline), 3 V (lithium coin cell), 4.5 V, 6 V, 9 V and 12 V. It must be respected. 1.2 V rechargeables work in most 1.5 V devices, but in some instruments the lower voltage causes problems: check the manual.

Battery type. Alkaline, lithium, rechargeable. Alkaline is inexpensive and fine for normal use. Lithium copes better with temperature extremes and lasts a long time when idle. Rechargeable pays off if you use it a lot.

Pack size. From 1 to 12 pieces per blister pack: choose according to the spares you need.

Use. Some batteries are designed for a specific use, such as hearing aids, remote controls or cameras, or for indoor environments.

Common mistakes

• Mixing new and used batteries, or batteries of different types: the weaker ones discharge first and may leak.
• Charging with the wrong charger: rechargeables must only be charged with a charger suited to their chemistry.
• Leaving batteries in a device that sits idle for months: take them out, so as not to damage the contacts.
• Reversing the polarity: check the + and - marks in the compartment.
• Throwing spent batteries in the ordinary waste: they go in the dedicated collection containers.

Frequently asked questions

Can I use a rechargeable battery instead of an alkaline one?

Almost always yes, if the size is the same. The voltage is slightly lower (1.2 V against 1.5 V), so check the device's manual.

Which battery goes in remote controls?

It depends on the remote control: it may be an alkaline mini battery or a lithium coin cell. Read the code on the old battery.

What is the difference between AA and AAA?

AA is the standard size, AAA the smaller one. They have the same voltage but are not interchangeable.

Can ordinary alkaline batteries be recharged?

No: only those marked as rechargeable can be recharged, with a suitable charger.

All sizes are in the batteries collection; if you cannot find the size you are looking for, ask the AMES technicians for a quote or advice.