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I can't understand why Amazon chooses to combine all eneloop-related products into one product page. That include all regular Sanyo eneloop AA/AAA cells, high capacity Sanyo XX AA/AAA cells, 4-cell charger, 2-cell charger, combo pack, and so on. This is a very BAD practice in my opinion, because it makes it difficult f… see more I can't understand why Amazon chooses to combine all eneloop-related products into one product page. That include all regular Sanyo eneloop AA/AAA cells, high capacity Sanyo XX AA/AAA cells, 4-cell charger, 2-cell charger, combo pack, and so on. This is a very BAD practice in my opinion, because it makes it difficult for customers looking for reviews on a particular product. It also creates a lot of confusions among some customers, who often accuse reviewers for posting reviews for the 'wrong' product.
Some useful hints:
1. Pay attention to the "This review is from ..." line at the beginning of every review
2. Use the "Search Customer Review" window to search for keywords such as "Sanyo XX AA" see less

By NLee the Engineer on March 10, 2013
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Rechargeable batteries are usually 1.2v, while alkaline are 1.5v. AA batteries hold a lower amount of energy reserves depending on what you buy (anywhere from 750 mAh to 2000 mAh). Alkaline D batteries hold a lot more, depending on the brand (up to 17,000 mAh that I have seen). The spacers would be less useful, or mayb… see more Rechargeable batteries are usually 1.2v, while alkaline are 1.5v. AA batteries hold a lower amount of energy reserves depending on what you buy (anywhere from 750 mAh to 2000 mAh). Alkaline D batteries hold a lot more, depending on the brand (up to 17,000 mAh that I have seen). The spacers would be less useful, or maybe even useless, for high energy usage, but work quite well with low energy use. I have a set so that I can use them in my lanterns during power outages, since I have a lot of AA rechargeable batteries for TV/AV remotes etc.. I don't want the bulk of lots of extra D cells. see less
By J. Lillpopp on October 5, 2013
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You are correct in your thinking. Only one battery per adapter.
By R. C. Lewis on July 5, 2014
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Hello. They will work with any device that uses standard AAA batteries. Good luck.
By Ruben Dario Hiciano on November 13, 2013
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My AAA has on them HR-4UTGA. Hope this helps you out...
By DJ on January 29, 2014
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Both the HR-3UTGA (AA) and HR-4UTGA(AAA) are the 2nd generation eneloop batteries. The HR-3UTGB(AA) and the 4-UTGB(AAA) are the 3rd generation. (see link here: http://en.wikipedia.org/wiki/Eneloop) You should always go by what's printed on the batteries, not on the packages. I always check the battery model # before op… see more Both the HR-3UTGA (AA) and HR-4UTGA(AAA) are the 2nd generation eneloop batteries. The HR-3UTGB(AA) and the 4-UTGB(AAA) are the 3rd generation. (see link here: http://en.wikipedia.org/wiki/Eneloop) You should always go by what's printed on the batteries, not on the packages. I always check the battery model # before opening the package. If your batteries have 3UTGA, you got the 2nd generation batteries. This has happened to me once at a different vendor, and I was able to exchange them. see less
By J. Pan on December 13, 2013
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Its a ripoff, they are coming in 1800 cycle 3rd gen packaging but the cells are 2nd gen!!!! I got 3 orders of AAA and AA and they all have model numbers ending in A with no line under the crown, clearly 2nd gen batteries and it is inexcusable for Amazon to continue to sell these because they KNOW of the problem
By John L on March 16, 2014
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Sanyo Charger #NC-MQN06. Owner's Manual here:
http://us.sanyo.com/dynamic/product/Downloads/4_Position_Charger_IS-4508168.pdf

By Bugman on January 20, 2013
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The instructions that come with this pack clearly state that one or two batteries can be charged.
By mikemild13 on January 28, 2014