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Best Buy batteries

by Sarah Ingrams

The best AA disposable batteries will last more than seven hours longer than the worst in some of your devices. We’ve tested AA and AAA batteries to reveal the best for your budget.

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

It can cost up to £7 for a pack of four disposable batteries, but the priciest batteries aren’t always the best. Our independent tests reveal which alkaline and lithium batteries actually last the longest, whatever device you use them in.

Not only do we make sure the Best Buy batteries we recommend are up to the job, we also show you how much they cost you per hour. Plus we highlight any batteries that score very poorly so you don’t waste your cash on a short-lived battery.

  • We test the batteries in a range of power-hungry conditions so you can be sure that whatever device you use - from a power-guzzling child's toy to a clock - your Best Buy battery will last longer than the rest. 
  • When we test batteries in high-drain devices, such as digital cameras and remote-controlled cars, our Best Buys give you almost two-and-a-half hours’ more use than other batteries. 
  • In medium-drain devices, such as outdoor Christmas lights or games-console controllers, you can get up to seven extra hours of battery life. 
  • We also uncover the batteries that are most likely to leak when they’re flat, ruining your remote control, camera or torch.

Join Which? to unlock our batteries recommendations on this page. You'll also get access to all our online reviews, including Best Buy rechargeable batteries. Already a member? Log in now.

How we uncover the best batteries

Every year, we analyse more than 1.5m pieces of data in our disposable batteries tests. So when you use a Best Buy battery, you can be sure that it will power your devices for longer than rival batteries. 

  • High-drain battery life Taking a motorised toy or remote-controlled device as our model, we measure how long each battery lasts in some of the toughest conditions you’re likely to use it in at home. The best last up to two and a half hours longer than the worst.
  • Medium-drain battery life Simulating the types of devices you use often - such as games-console handsets - we time how long each battery will power them. The best batteries will give you seven hours more power than the worst.
  • Low-drain battery life We know you use your batteries in low-drain devices too, such as clocks. So we also compare which batteries last the longest in these devices.
  • Leakage We store flat batteries to see whether they’re likely to leak if left in your device. The worst brand had several batteries leak after six weeks, which could irreversibly damage your device if you don't spot it.

Battery reviews you can trust

Batteries from the biggest brands, such as Duracell and Energizer, go head to head in our testing with supermarket own-brands. And the results show that the priciest aren’t always the best.

Which? is independent - we work for you, the consumer, so you can be sure that our product recommendations are influenced only by our test results. We don't take advertising and we buy all the products that we test ourselves, so our advice helps you to make the right choice first time and avoid costly mistakes.

Join Which? and you'll unlock our battery Best Buys, plus receive access to all our online content and get Which? magazine delivered to your door. You can also phone our Which? Legal Service and personal finance experts for one-to-one help. Already a member? Log in now to reveal all our our Best Buys.