Energizer Ultimate Lithium AAA Batteries (FR03) - 4 Pack

These are Energizer Ultimate Lithium cells in the AAA size, supplied as a 3+1 bonus pack, so four cells reach you on one card. Each one is a 1.5V lithium cell carrying the code FR03, printed on the back of the pack as AAA-FR03 1.5V Lithium. The pack also prints a 25 year shelf life, and describes the cells as the world's longest lasting in high tech devices. Small print on the front adds that the steel casing includes up to 10% recycled material.

AAA is the slimmer of the two common household sizes, and it turns up in remote controls, wireless keyboards and mice, head torches, digital thermometers, door sensors and children's toys. The chemistry is the point of difference here rather than the size. A lithium cell of this type weighs noticeably less than an alkaline one and holds its voltage more steadily as it runs down, which is why people buying for cameras, outdoor kit and cold weather tend to choose it. If a device only ever sips power, a wall clock being the usual example, an ordinary alkaline cell is the cheaper way to feed it and the lithium is wasted on the job.

Four cells arrive on one blister card, and that card is one unit of this listing. Our minimum order is 12 units, sold in multiples of 12, which suits a shop, a facilities cupboard or an events kit rather than a single household spare. There is nothing to set up: lift the cells off the card and put the remainder away. We stock the wider Energizer battery range too, including AA and AAA Alkaline Power cells, C, D and 9V alkaline cells, and CR2032 lithium coin cells.

How many batteries do I actually get?

Four. The card is marked 3+1 bonus pack, which means three cells plus one extra, and all four are identical AAA lithium cells.

Will these fit anything that takes ordinary AAA batteries?

Yes. They are the standard AAA size at 1.5V, so they drop into any device built for AAA cells without adapters or packing.

Can I recharge them?

No. FR03 is a single use lithium cell, so once it is flat it goes to a battery recycling point rather than onto a charger.

What does the 25 year shelf life mean in practice?

The pack prints a 25 year storage life, so a spare kept in a drawer should still be usable long after purchase.

Why buy lithium rather than alkaline AAA?

Lithium cells are lighter and hold voltage more evenly as they discharge, which suits cameras, head torches and kit used in the cold.

How does the minimum order of 12 work?

You order at least 12 packs, in multiples of 12, so the smallest order is 12 cards and therefore 48 individual AAA cells.