Finding the best buy for batteries

There is a good chance you will need fresh batteries when all of the presents under the tree have been opened.

AAs are the most popular size for batteries, and Consumer Reports ShopSmart magazine sifted through test results to find out which will keep you powered up for less.

You could spend a bundle on batteries and still wind up with duds. So Consumer Reports put 15 AA batteries to the test - both lithium and alkaline - to help you get the most for your money.

In the lab, batteries are connected to machines, which cycle them on and off, over and over, simulating use in both toys and flashlights.

The top two performers are lithium: The Energizer Ultimate Lithium and the Energizer Advanced Lithium.

But they cost more than $2 per battery. For people who use a lot of batteries, Consumer Reports ShopSmart magazine found some good, less expensive options.

Jody Rohlena from Consumer Reports explains, "You know, lithiums last a long time, but you'll pay a lot more for them. Plus, we found some long-lasting alkalines and they cost a lot less."

The Duracell Quantum AA alkaline batteries give you almost the same amount of hours in both flashlights and toys as the top-rated lithiums, for about $1 each.

The Kirkland Signature AAs from Costco are the biggest bargain, at just 27 cents apiece. They kept up with the Duracells in toy tests and gave up less than a half an hour of use in flashlights.

Both will keep you rolling along, for less.

To make batteries last longer, there's no need to store them in the refrigerator, but Consumer Reports says it does pay to store them in a cool, dry place.