The Longest Lasting Rechargeable AA Batteries

For powering high-drain electronics such as digital cameras, the most efficient batteries to use are Nickel Metal Hydride (NiMH) cells. Higher capacity batteries store more charge and they can power your devices longer.

The highest capacity rechargeable AA batteries are: Ansmann’s 2850 mAh batteries and Powerex’s 2700 mAh batteries. Of these two batteries, Powerex’s 2700 mAh gets the most positive reviews from photographers. It received an average of 4 out 5 stars from 98+ reviewers on Amazon.

Sanyo XX "Powered By Eneloop"

However, in my opinion, the best choice for a high capacity AA battery is now the Eneloop Pro. These batteries hold their charge for 12 months. They also have a high energy capacity (2500 mAh), and they perform better than similar high-capacity AAs. See my review here.

42 thoughts on “The Longest Lasting Rechargeable AA Batteries”

  1. True story, sorry this might be classed as a Physics lesson so be pre – warned. I used to work for the UK Ministry of Defence making military hardware of all kinds. Some of our kit was powered by Batteries and rechargeable NIMh ones. When charged we measured the atomic weight one day. the fully charged batteries actually weighed in at 0.00000000001g extra we could not account for this! Otherwise we tried the same on a USB stick with data, VS a USB Stick that had no data. the new stick weights fractions of a g(ram) lower than the USB Stick with data. om the battery discussion, I would stick with proven Camera persons recommends. I only use mine (two of these ) in a Touch Controller (for the Rift S) they last ages.

  2. I have a Chinese 4-LED solar light on my flagpole. It is powered by 3-AA rechargeable batteries. To date, I have not found batteries that will keep my flag lighted through the dark hours, from 5:30pm to 6:30am. What batteries would be the very best for this application? I don’t mind spending more money, if the product will do the job fully. It has become a pain to disconnect and recharge batteries daily.

  3. Some great rechargeables. Some rechargeables can be found in 1.2v rather than 1.5v and for some devices that need a solid 5v to run – 4 AA batteries at 1.5v can do the trick where 4 batteries at 1.2v will hurt the interal powering or not work at all. Overall, these look like great options

  4. Ansmann’s 2850 mAh batteries are good to use and they truly are the best! It’s not worth it buying the cheap energize batteries and throwing them out later. By buying batteries that last you’ll save money in the long run! Thanks for the article

  5. Shawn: the 5v is for devices that take 4 AA batteries – 1.2v * 4 = 4.8v, or 1.5v * 4 = 6v. It’s not referring to a single AA battery operating at 5v by itself.

  6. You have to be careful what you recommend here. Powerex actually provide a great charger analyser by Maha, with it I provided open details on all batteries I sold. Firstly I tested them all, Sony cyclenergy (white and silver), Eneloop, Camelion, GP, many cheap Chinese variations and more expensive Chinese variations.

    The only brand that could “reach” its advertised capacity “and maintain” that capacity was Eneloop.

    The Powerex 2700 that came with the charger were rubbish, the Silver Sony were similar. They are good for short term high drain use only, also their capacities were varied out of the box, became better with the Maha’s break-in function but in use became more varied again and loosing capacity. The White Sony’s couldn’t even be matched, one cell was short by a large amount and still 300mAh short after several break-ins.

    Generally speaking batteries are terrible, branded capacities are way off, more so on Chinese batteries.

    Eneloop & Camelion were the best of the well known brands. Ultracell Plus+ was the best Chinese battery, their AAA also had and maintained the highest capacity of any other AAA NiMH I tested. Another brand was Powercell they had the best LSD, better than the generation 2 Eneloop I was testing them with. But the capacity is way off what was marked. But for things like remotes they were as sooted to them as Eneloop with a fraction of the price.

    Also the climate you live in changes the way each brand behaves. The hot humid climates of Asia take a toll on many brands, again the above batteries I recommend still performed as usual.

  7. I use Ansmann’s 2850 mAh batteries all the time and they truly are the best! It’s not worth it buying the cheap energize batteries and throwing them out just a few weeks or month later. Do yourself a favor and invest in some batteries that will last!

    Thank you for the great article

  8. 1.2v vs 1.5 volts is a misnomer. “1.5v” alkaline cells spend most of their life in the ~1.2v range, so anything that works at that voltage will work. NiMH cells actually have a coincidental advantage of having a much flatter voltage range.

    1. Right. If you look at the voltage otuput curves of alkaline vs NiMH, the alkalines start at 1.5-1.6 but only mantain it for a little whiel, where NiMH tends to maintain that 1.2-1.25 steadily up until near the very end for good batteries, and almost anything that will run on alkalines will run just fine on NiMH (there are rare exceptions that perform slightly better on the higher voltage, but that doesn’t last and most quality gear is not designed to run okay for 15-20% of battery life and then run like crap for the rest of the life of the battery.

  9. What about Vapex 2900 mAh AA cells ? Four for $10US. Very good quality batteries from Europe that even come in nice little reusable plastic boxes. I use them to power my SFK Useless Eater Terminator killer android **)

  10. Excellent information everyone, I’m on my 2nd set of Energizer 2500mAh NiMH batteries, these are listed at 1.2V. the first set lasted 15 months and came with the charger for $ 31.97 at Walmart. the 2nd set has lasted 22 months and cost $ 24.99 at The Source (Used to be Radioshack) I had trouble finding the 2500’s it seems they’ve been replaced by the 2300’s.

  11. Although the “nominal” voltage is higher for alkaline and zinc batteries (1.5) than for NiMH and NiCd (1.2) the actual voltage varies through the discharge cycle and batteries (all these types) are generally counted as fully discharged with a remaining voltage of 1V. Look at the discharge curves and you will see this means NiMH will work just as well if not better in most applications.

  12. Most modern electronics will specify 1.5v Alkaline or Nickel, or 1.2v Ni-MH or Ni-CD, so shouldn’t be an issue if you’re using something in the last few years.

    As for the extra mAh worth the price, it’s what you need the batteries for. If you are a professional or aspiring photographer, the extra power in your flash will make a huge difference in your flash recycle time. Definitely worth it. If it’s for a portable alarm clock, or even wii remotes, you’ll be fine with regular rechargeables, like the Energizer, or even the hybrids, which slow drain for those items only used occasionally.

  13. Becareful about some rechargeables. They can be found in 1.2v rather than 1.5v ( you may nee to check ) and for some devices that need a solid 5v to run – 4 AA batteries at 1.5v is fine where 4 batteries at 1.2v will distress the interal powering or not work at all.

    1. Rechargeable batteries have always been 1.2V… As long as i can remember…and ive been using them a little over 20 years!! Also never had a problem using rechargeables in an item like a flashlight or other item that required 6V…not sure what your using that runs at 5V???

      1. He’s not saying that the required voltage is 5v, he is saying that some electronics require the 6v from 1.5 volt AA batteries as the lower 5v from rechargeable batteries can damage some electronics and just to add I’ve been using these daily for almost 40 years.

        It’s clear you really don’t understand battery chemistry as well as voltage requirements and curves.

        I would be happy to educate however I charge for that as this is my business!!

        I’m no amateur, I have been involved in my earlier years in the design and production of cells so please don’t assume that you have more knowledge as you’ve “messed around ” with rechargeable batteries for 20 years.

        The letters after my name are my credentials….


    2. 5-volt power is specified at +/- 10%. Therefore, anywhere from 4.5 to 5.5 will work. 4x NiMh comes out to about 4.8 volts, which is pretty safe. Some 5 volt things will operate down to 4 volts, but don’t count on it. Alkalines will be at least 6 volts, closer to 7 volts when they’re new. This is not good for 5-volt rated devices. You are better off using an up/down DC-DC converter to keep the 5 volts output constant regardless of the input.

  14. Sure it’s quite a bit of extra charge, but the big question is whether it’s worth the much higher price? For example (all prices are approximate from,

    Energizer 2500mAh: ~$20.50/8 => $2.56/battery
    Delkin 2900mAh: ~$17/4 => $4.25/battery
    Ansmann 2850mAh: ~$31/4 => $7.75/battery

    Will I really get 3x the usage out of an Ansmann or even 2x out of the Delkins? If not, then sticking with the Energizer 2500mAh cells is the way to go.

    Just my $0.02!

  15. As always, this is another great article by MetaEfficient. MetaEfficient seems to be always at the top of battery techs. Here is an article I found recently about NiZn batteries on the market. The reviews for these batteries are mixed, with good use but mediocre storage life . They are supposed to be quite safe for the environment and very recyclable.

    Also, something to look out for in the future: rechargeable zinc air batteries! I hope they make it to the consumer market.

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