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  • Sony NHAAB4KN Cycle Energy 2000 mAh Pre-Charged AA Rechargeable Batteries
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Sony NHAAB4KN Cycle Energy 2000 mAh Pre-Charged AA Rechargeable Batteries

by Sony
91 customer reviews
| 6 answered questions

List Price: $18.00
Price: $8.95 + $7.49 shipping
You Save: $9.05 (50%)
Only 16 left in stock.
Ships from and sold by Adorama Camera.
  • New improved NiMh rechargeable battery technology
  • Already charged and ready to use
  • Stays 85% charged after 1 year of storage
  • Recharge up to 1000 times
5 new from $8.95 1 used from $10.95

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$8.95 + $7.49 shipping Only 16 left in stock. Ships from and sold by Adorama Camera.

Frequently Bought Together

Sony NHAAB4KN Cycle Energy 2000 mAh Pre-Charged AA Rechargeable Batteries + Sony BCG34HRE4KN Cycle Energy Quick with Refresh Charger and 4 Pre-Charged 2000 mAh AA Batteries (Discontinued by Manufacturer)
Price for both: $39.90

These items are shipped from and sold by different sellers.

Buy the selected items together

Technical Details

  • Brand Name: Sony
  • Model Number: NHAAB4KN
  • Battery Description: Alkaline
  • Battery Type: NiMh
  • Item Package Quantity: 1

Product Description

Sony's newest rechargeable battery technology seeks to bridge the gap between regular alkaline batteries and NiMH rechargeable batteries. Cycle Energy rechargeable batteries do not require initial charging and have a very low self discharge rate. They maintain 85 percent of their charge after one year and can be recharged up to 1,000 times. This new technology offers consumers the convenience of a ready-to-use rechargeable battery that is longer lasting.


Product Details

  • Product Dimensions: 0.5 x 2.5 x 4.5 inches
  • Shipping Weight: 3.2 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B000PHMN44
  • Item model number: NHAAB4KN
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (91 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: June 17, 2003

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

77 of 77 people found the following review helpful By NLee the Engineer HALL OF FAMETOP 50 REVIEWER on December 23, 2010
The Sony Cycle Energy 2000 mAh Pre-Charged AA Rechargeable Batteries are low-self-discharge NiMH type, similar to the more well-known SANYO eneloop. Even their marketing claims sounded almost identical, such as:
- 'Stays 85% charged after 1 year of storage'
- 'Recharge up to 1000 times' (2nd-gen eneloop cells actually claim to achieve 1500 cycles)
- 'Battery Capacity: 2000 mAh'

Naturally, this leads to speculation that SONY Cycle Energy is just Sanyo eneloop under a different wrapper. But apparently it is not the case, based on the following observations:

1. There are minor differences in shapes of positive and negative terminals between those two brands. (See my Customer Images uploaded, and judge for yourself)
2. SONY Cycle Energy cells are made in China, while Sanyo eneloop cells are only manufactured in Japan.

Of course, the real important question is: Do SONY Cycle Energy cells perform just as well as Sanyo eneloop cells? The answer is YES - based on my own test data so far.

I have tested a set of those SONY Cycle Energy AA cells, using my La Crosse BC-900.
Read more ›
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102 of 122 people found the following review helpful By Chris G. Sebastian on July 1, 2008
Verified Purchase
I am an electrical engineer, and I have tested many, many batteries. The Sony CycleEnery batteries are the best batteries in the world. No other battery has performed as well for me. I highly recommend this battery above all others.

There are two things that make the Sony CycleEnery battery perform so well:

First, if you weigh the Sony battery on a scale, you will find that they are several grams heavier than any of the other brands. This means that there is more material inside, which yields a higher battery life span.

Second, the voltage curve of this battery stays above 1.2 Volts throughout the majority of its life span. The reason this is important is that most electronic devices, such as digital cameras, stop working once the voltage goes below 1.1 Volts. Normal NiMH batteries can have extremely high mAh ratings of 2500 or more -- but you can't actually make use of all those mAh's because the voltage drops below 1.1V relatively early -- this is not the case with the CycleEnergy. Sony has done something to keep the voltage up at 1.2V, so even though the battery is only rated at 2000mAh, they last much, much longer than normal NiMH batteries. I usually get 2-4x the life span out of CycleEnergy batteries, compared to normal NiMH (even the Sony ones!).

To summarize -- these are the best rechargeable batteries on the market right now (2008).

Regards,

~Chris Sebastian
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17 of 18 people found the following review helpful By MikeP on June 2, 2010
Verified Purchase
I bought two sets of AA and one AAA of these Sony Cycle Energy batteries from a large NY-based and internet camera store during an 8 USD/AA 4-pack deal was posted on slickdeals a couple of weeks ago and I wanted to relay my experience. (Though I do buy most everything else at Amazon!)

All of the batteries were made in China as per prior posts. They all came out of the package with decent voltage (1.3v? I don't recall exactly) but at maybe 50% of the rated charge of 2000 mAH. I personally don't much care since I was going to charge before using anyway. I had encountered a significant variation with 4 of the 8 AA batteries -- 3 from one pack and one from the other pack.

I use the La Crosse BC-700. I did a simple charge of all of the batteries first. That did not bring the charge up near the rated level. On the first 4, I did a single full discharge-charge cycle and they went up as high as almost 2400mAH! Great! The other 4 did not fare as well. A discharge-charge cycle still did not get them up to 2000 mAH, though mostly in the ballpark. I then did a full "refresh" (repeating discharge/charge cycles until no improvement) and 2 made it to 2030 mAH, while the other 2 only 1970mAH.

SUMMARY:
With discharges and refreshes, all of the brand new Sony's were able to get within an acceptable tolerance +/- of the rated charge and some went far beyond the rating. My main point being that not all of these Sony's are created equal. I'm still using a set of Eneloops for my SLR flash, but these are just fine for wireless mice, WiiMotes, toys, and the like.
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8 of 9 people found the following review helpful By John J. Nelson on February 6, 2009
After trying nearly every rechargeable battery and being disappointed that they did not arrive pre-charged as claimed, the Sony Cycle Energy batteries arrived ready to go, just as claimed. The higher price and lower mAh were a matter of concern for me before I ordered. Sony has 2500 mAh for less here on Amazon, but careful reading of the customer reviews led me to this choice and so far I'm very pleased. One surprise was to read the fine print (and I do mean fine) on the battery back and discover that these are based on eneloop technology. I could have bought the eneloops for less and that had been my first choice until I read the reviews. I suppose the hybrid technology is driving all the brands I tried, but Sony is the first to deliver on the promise. Sony Cycle Energy AA Ni-MH Rechargeable Batteries (4-Pack)
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