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Sony Cycle Energy AA Ni-MH Rechargeable Batteries (4-Pack) | 
 enlarge | Brand: Sony Batteries
Category: CE
List Price: $14.99
Buy New: $9.79
You Save: $5.20 (35%)
New (22) from $9.79
Avg. Customer Rating:  6 reviews
Media: Electronics
Autographed: No
Memorabilia: No
Battery Type: NiMh
Shipping Weight (lbs): 1
Dimensions (in): 0.5 x 2.5 x 4.5
Legal Disclaimer: Warranty does not cover misuse of product.
MPN: NH-AA-B4K
Model: NH-AA-B4K
UPC: 008562010130
EAN: 0008562010130
ASIN: B000PHMN44
Release Date: April 1, 2007
Availability: Usually ships in 1-2 business days
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| Features:
| • | 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 | | • | Battery Capacity: 2000 mah |
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| Similar Items:
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| Editorial Reviews:
Product Description
SONY NH-AA-B4K CYCLEENERGY BATTERY BLISTER MULTIPACK (AA 4-PK) CYCLEENERGY BATTERIES; DO NOT REQUIRE INITIAL CHARGING; MAINTAINS 85% OF THEIR CHARGE AFTER 1 YEAR; RECHARGEABLE UP TO 1000 TIMES ; AA; 4-PK
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| Customer Reviews: Read 1 more reviews...
 Keep their charge, last a long time January 2, 2009
I've been using these batteries in my camera for over a year now and they are still as good as new. I also recently started using them in the Wii remotes and Wii fit balance board and the performance is amazing. It has been over 3 weeks and still no need to charge them.
 so far so good November 19, 2008
2 out of 3 found this review helpful
Came charged out of the box, so far so good, but will know only in the long run.
Excellent batteries July 6, 2008
6 out of 7 found this review helpful
They really last a lot. Other batteries that I have do not hold charge for a long period.
The best battery. July 1, 2008
28 out of 29 found this review helpful
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
Better than 2400mAh batteries May 15, 2008
5 out of 8 found this review helpful
I'm using these batteries with 2400mAh batteries made by Sony. Those last longer than these. I use primarily them in my Garmin GPSmap 60Csx navigator. They last about 20 hours without backlight. With 2400mAh batteries, in same use, it last about 18 hours.
I'm giving 4 stars, because I'm not sure about its life cycle.
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