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Powerex AA 2700mAh NiMH Rechargeable Batteries w/holder- 4 Batteries Per Pack | 
| Brand: Powerex
Category: CE
List Price: $16.95
Buy New: $11.85
You Save: $5.10 (30%)
New (6) from $11.85
Rating:  20 reviews
Media: Electronics
Autographed: No
Memorabilia: No
Battery Type: NiMh
MPN: MH-4AA270-BH
Model: MH-4AA270-BH
UPC: 802366141539
EAN: 0802366141539
ASIN: B0009H5VVM
Availability: Usually ships in 1-2 business days
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| Features:
| • | PowerEx Ultra high capacity AA batteries offer a super long run time! That's atleast 30-40% more than most competitors! Plus our batteries can be charged up to 1000 times. | | • | PowerEx batteries are manufactured to Industrial standards for the consumer market and last up to twice as long as ordinary rechargeable batteries. | | • | Includes a free battery carrying case. | | • | Memory free operation means you can charge PowerEX batteries anytime you like and don't worry you can charge 2500mah PowerEx batteries using any AA compatible Maha Charger. | | • | Excellent for power intensive devices like digital cameras, MP3 Players, Game Boy, CD Players, Global Position System, etc. |
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| Editorial Reviews:
Product Description
Maha Energy is a global leader specializing in the design, manufacturing, and distribution of battery and charging technology for various industrial and consumer sectors. With state-of-the-art research labs and production facilities, Maha creates a global service network for both standard and custom-designed applications.PRODUCT FEATURES:PowerEx Ultra high capacity AA batteries offer a super long run time! That's up to 30-40% more than some competitors! Recharge hundreds of times;PowerEx batteries are manufactured to industrial standards for the consumer market;Comes with a PowerEx battery carrying case that can hold up to four AA or AAA batteries;Memory free operation means you can charge PowerEX batteries anytime;Excellent for power intensive devices like digital cameras, MP3 Players, Game Boy, CD Players, Global Position System, etc.
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| Customer Reviews: Read 15 more reviews...
 Less than a year of reliability November 13, 2008
I have to agree with another reviewer who said that after less than a year of use, these rechargeable batteries begin to self-discharge rapidly. Over the last 3 years, I have used 20 of these Powerex NiMH rechargeable batteries for my digital camera, and every single one of them had this problem. Within the first few months of purchase, they were able to retain their charge for several weeks when they were not in use (even that is not long enough). Then their ability to retain charge declined gradually to the point that, after another few months, they couldn't even stay charged for a single day. Imagine that you bring these with you on your vacation and before you even get off the plane you realize they have all lost their power. And since they lose power so easily, you have to keep charging them probably more often than you need to, and that will shorten the batteries' lifetime even more.
I also suspect whether these Powerex batteries can actually give you "hundreds" of charges in their lifetime. I charged mine about 20 times a year in the last 3 years, and a few of them have degraded to the point that even my charger can't detect its presence.
I have a Powerex MH-C801D charger that is supposed to be able to recondition and "revive" these "dead" NiMH batteries. It will revive unchargeable dead batteries so they can be charged again (for another few months or so), at least that was what it did to my dead Powerex batteries. But it will not slow down their self-discharge rate.
If you need to keep spare rechargeable batteries that stay charged for long periods, my advice is not use these Powerex batteries and try those much longer-lasting Sanyo Eneloop batteries instead, which I'm now doing.
 Powerex 2700Ah NiMH Rechargeable Batteries October 18, 2008
These are the finiest rechargeable batteries made. I use them in my Nikon SB800 flash unit and recovery time between flashes is excellent.
These die after months of use August 24, 2008
2 out of 3 found this review helpful
Powerex AA rechargeable batteries
Although touted as having the power necessary to run digital cameras, these 2700 mAh batteries will last you less than a year. Unlike the current crop of batteries designed to hold charges for extended periods, these batteries won't stay charged in an unused digital camera for more than a day after a few months of use.
I checked to make sure it wasn't my camera draining the batteries- using Eneloops, it was clear there was not a power drain problem. Using the batteries in an electric toothbrush, I again found the power falling off rapidly after a couple of days of non-use.
Testing conditions for these were meant to be ideal- the batteries were kept in a Powerex AA battery charger specifically designed to maintain charge and condition the batteries. Despite this, after several months of very light use, batteries taken fully charged out of the charger and put into a camera would hold a charge for about 2 days before burning out. Under the exact same conditions, my Eneloop batteries would hold a charge for many days, maybe weeks. Initially the Powerex batteries could hold a charge for several weeks, but this capacity was quickly lost after about 9 months.
Therefore if you're looking for long-term savings on AA batteries by using NiMH rechargeables, stay away from Powerex.
Rating: 2 stars
Recommended: No
Great batteries August 16, 2008
2 out of 2 found this review helpful
This is the first time I have purchased rechargeable AA NiMH batteries. I purchased them specifically for a Canon 580EX II flash. Flashes eat up batteries. I have also used them in my MineLab metal detector. The batteries have worked great and I am very pleased with this brand.
Buying more PowerX batteries July 19, 2008
2 out of 2 found this review helpful
I currently own 8 2300 mAh batteries, purchased 2 years ago. Not one problem with them and they are still going strong, maybe not like new, but I can't measure the difference.
12 of some off-brand name AA's I have went to the great beyond and need to be replaced and am purchasing 8 2700 mAh PowerX batteries today.
I use them in my Canon580EX II and Metz 54 flash units. A portable power pack costs more, weighs more and is a PIA to carry around. These hi-mAh batteries give a big bang for the buck and the plastic carry-case's can be carried comfortably in your pockets.
Plus I use them in my Oly C-5050 and as stand-by for my Canon 5D should I run out of juice from the Lithium Canon Batteries. They are also used for my portable TV, AM/FM radio, aircraft headsets and race track radio gear.
I also have 2 Maha MH-C401FS 1 hour chargers and I can't praise them enough. You can actually tell when one cell is failing because it takes longer to charge (red light stays on) since each battery is charged independently from the others. That is also a very good buy.
I don't know anyone who uses the Sanyo brand so I can't comment. I am a pro-photographer.
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