0ur opinion: :S0NY NH-AA-B4E RECHARGEABLE NlMH BATTERY BLlSTER MULTlPACK (AA 4-PK) L0NG LASTlNG; lDEAL F0R ALL DlGlTAL DEVlCES; AA; 4-PK
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Simply incomparable ...
All batteries considered competition to the strong and dependable Sony 2500 mAh AA, are simply ill prepared.
Buyer's feedback: 
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Sony Batteries Work Great - Good Price
I found myself buying batteries in the biggest packages I could find... and was buying those packages twice a year. I was burning through 40+ batteries each year powering remotes, beard trimmer, optical mouse and wireless keyboard, etc. Needless to say, this was not a very environmentally friendly practice... so I found that the switch was not just economical, but a moral necessity. Now, I am saving money, powering my peripherals at a constant voltage, and not discarding pounds of batteries each year. I own all sorts of brands of these things, and the Sony batteries hold up just as well as any. A good purchase all around.
One piece of advice: remember to buy four extra to have charged and ready to go... most chargers require a bit of time between plugging and playing.
Buyer's feedback: 
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* When compared to Sanyo 2700 there is no comparison ...
I have 12 of these Sony batteries.
I got them without checking out the reviews.
Then I got the LaCrosse battery charger which allows you to charge at different rates and actually see how much the milliampHour is stored.
I also read the reviews and got interested in the Sanyo 2700.
Bottom Line:
If you are uninformed you will like the Sony's
I regret purchasing before becoming informed.
Take note that there are two types
Rechargable around 2700 maH
and
PreCharged around 2000 maH
The PreCharged will hold self life over a year from what I have read here.
Don't waste you time with anything besides Sanyo.
You're on your own now...at least you have been informed.
Buyer's feedback: 
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Leaves Alkis in the DUST!
I do a lot of instrumental music recording and performing, and I use these Sony rechargeables EXCLUSIVELY in my gear, the most power-hungry of which are my Zoom H2 Handy Portable Stereo Recorder and my GigLight Compact LED Music Stand Light. I also use them in my Canon PowerShot A720IS 8MP Digital Camera with 6x Optical Image Stabilized Zoom when going "optical" rather than "audible."
I can EASILY record two hours of music on my H2 with two of these batteries at 44.1kHz, 16-bit. I have never even come close to their running out early, and I've never had the device quit because of a lack of power. And I have recharged these MANY times for MANY gigs.
Loading my GigLight with these, I have found I can run it OVERNIGHT -- even 24 hours! -- and not drain them completely.
Plus, the batteries last between 200-400 pictures in my Canon, depending on whether I'm using a lot of flash and whether or not I leave the AF on "continuous." I'm never short of power. It's amazing.
Charge time is very reasonable, and when I use the H2, which uses only 2 batteries, I have a spare pair at the ready if I need them.
These leave Alkis in the dust! HIGHLY recommended -- and that's high praise because I'm generally NOT a Sony fan. But I am a fan of these!
Buyer's feedback: 
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* Awesome batteries! Quick charge! ...
these are exactly what I was looking for. Came fast, charged up and have not needed a recharge in almost 2 weeks! Im using a Coolpix Nikon Camera!