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Do Rechargeable Lithium-Ion AA Batteries Exist?

Do rechargeable lithium-ion batteries exist in standard sizes like AA, AAA, C or D?

Yes, they are finally available. A company called Kentli has released AA and AAA rechargeable lithium polymer batteries that output 1.5 volts.

Kentli batteries are available on Amazon here.

Update October 2019: I also found Tenavolt batteries which are cheaper than the Kentli, however I have not tested them.

New-KENTLI-2pcs-1-5v-2800mAh-Lithium-ion-Polymer-Rechargeable-Battery-Charger-AA-Batteries-Pack-4

Lithium-ion batteries normally operate 3.7V per cell — but Kentli put circuitry inside the cells to reduce the voltage to 1.5 volts. The company claims that the batteries have a capacity of 2800mWh which matches Eneloop Pro (the NiMH batteries with the highest capacity).

Additionally, Kentli batteries are lighter than Eneloop Pro. However, they are more expensive. A four pack of Eneloop Pros costs about $17, whereas a 4 pack of Kentli cells costs about $34.

Sanyo XX "Powered By Eneloop"

Other Lithium-Ion Rechargeables

Tesla-Battery-Cell-18650

There are also some lithium-ion rechargeable batteries made for high-performance flashlights and cameras, in these sizes: 18650 and CR123.

A single 18650 battery can replace two CR123A batteries, although at a lower voltage (but much higher amperage). However, the 18650 is a wider cell and will not fit into a flashlight that is designed strictly for the narrower CR123As. Most modern tactical LED lights are designed to use a single 18650 or two CR123As, but it’s best to check before buying. See our article on The Best 18650 Batteries for more information.

There are also numerous other types of lithium-ion batteries made for specific laptops and other electronics gadgets. There is currently no standard size for these lithium-ion cells.

Comments 19

  1. While Li-ion generally packs more energy in the same space as other battery technologies there are reasons why it doesn’t do well in AA/AAA applications. Li-ion cell voltage runs normally at around 3.7 V where all alkaline based batteries (what AA is built around) run at 1.5 volts. In addition Li-ion is inherently dangerous without circuitry to protect it. As such, making a AA sized li-ion battery requires sacrificing space in the battery for electronics to change the voltage and keep the battery safe. This reduction in space for electrochemical storage is why they do not really outperform Ni-MH right now. When you get to bigger sizes that can run at their nominal 3.7 volts, like an 18650, the improvement over other battery types is significant. As an example, trying to replace the cells in a laptop with the equivalent in NiMH would not come close to fitting in the same space.
    Due to the safety of Li-ion and the fact that these batteries have not undergone strict US testing/manufacturing standards it is recommended to stay with rechargeable NiMH in the time being. Hopefully, one day, Li-ion will improve enough that a AA type battery will exist that offers major improvement over NiMH. Right now their is little benefit (slightly better power, faster charge, and number of charge cycles) to outweigh the risks with li-ion cells of unknown quality. If it was that good you’d see the major US battery companies selling it, and they don’t so a good indicator something is off.

  2. I am loving the tenavolts, i have also tried the altizure which are 1.9v (could damage things) but have very low capacity, and I am going to try out deleepow next. The tenevolts power underccabinet lightning and run them for 7 days at a time (5-8 hours each day of use). Each light uses three tenevolts.

  3. mWh and mAh are different.

    Eneloop Pros are rated 2550mAh, Tenavolts are rated 2800mWh (they are equivalent to 1867mAh at 1.5V).

    1. good catch, a bit of trickery there. However tenavolts webpage indicates only 750mAh. I don’t understand the disparity. Your calculation, dividing Wah/V should be correct.
      Amp hours (mAh) X voltage = mWh
      volts = Amps * Resistance. Watts = Amps * Amps * resistance. m = milli, a prefix to indicate the small amount (without the m 2800mA = 2.8A)
      I assume this involves the conversion from ~3.7 volts to 1.5. 750 X 3.7=2775, but power is 1.5 X amps permitted through converter. So 2800mWH/750mAh=3.7
      I would assume there was some Voltage conversion loss as well. There are some things about these numbers that are a bit concerning….

  4. I feel I must echo what only one person has correctly pointed out in response so far (but for some reason has not been up voted as due for his correctness), for those of you who are not completely “in the know” – There indeed ARE Li-ion batteries that are the same form factor (size/shape) as traditional AA and AAA batteries.
    They are increasingly popular for high-drain devices such as high output LED flashlights (of which I have a few), and they are often THE cells that are being mentioned in things like laptop batteries and wireless rechargable hand tools.
    Crack open a 6-cell laptop battery and you’ll be likely to find six of the very same Li-Ion AA sized cells you can buy on eBay/Amazon shipped from China.
    They are often welded together in groupings that increase the total voltage to that needed by the 12 volt laptop requires.

  5. I’ve always used EverReady batteries. Not sure if they’re Lithium Ion batteries though. And they’re not rechargeable. Hoping to make the shift soon. How much does this cost?

  6. How do I get my hands on your lithium AA battery’s and charger, and how much will it cost me,

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      Author
    1. true but from the perspective of making a AA/AAA does it really matter? You want the most capacity you can get in the form factor. As long as its safe and reliable would it matter?

  7. I’ve used the Eneloops before and really liked them. They worked great and kept their charge for a long time. I’ll have to try the Eneloop Pro!

  8. I purchased two solar powered garden lights. they have AA 3.7V 600 mAh Li-ion batteries with a 14500 number. Do you know if there is a replacement battery for these, since they are very difficult to find? I am about to give up on finding any.

  9. I’m surprised nobody has done a double-AA L-iIon or Li-Po battery – same form factor as two AAs next to each other without the extra voltage circuitry (assuming things can handle a bit extra voltage). Depending on how the “connection” is done, there could be room for quite a bit of extra power.

    1. they do exist for specific applications, its a safety and packing issue. look at the xbox controller li-ion rechargeable packs, same idea. There are third party NiMH that outperform them.

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