Powerex AA 2700mAh NiMH Rechargeable Batteries w/holder- 4 Batteries Per Pack by Maha Energy Corporation
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Digital camera reviews of Powerex AA 2700mAh NiMH Rechargeable Batteries w/holder- 4 Batteries Per Pack
Digital camera Review: Less than a year use...
Summary: 1 Stars
Though they worked very nicely when I originally bought them less than a year ago, they no longer hold a charge AT ALL. I have kept them charged when not in use, switching out one pair for the next when needed in my digital camera. I just switched them over and the "fresh" set doesn't work at all now. Digital camera Review: Dont buy the hype
Summary: 3 Stars
Just like others said, they don't hold a charge for long and don't last under use. My old Kodaks lasted at least 3 times longer in my trackball and keyboard. Very disappointing. One more thing why 2700mAh the max charge is 2500mAh as printed on the battery.Digital camera Review: Good long lasting power
Summary: 4 Stars
I'm fully satisfied. I use these batteries in a very power hungry GPS device and they perform well.Digital camera Review: Will not keep a charge
Summary: 1 Stars
I bought these batteries due to online reviews and testing. However, the four I purchased have not lived up to the hype. All rechargeables leak off to some degree, but these have a hard time keeping a charge beyond two weeks, regardless of use.Digital camera Review: Simply the Best.
Summary: 5 Stars
I've purchased sixteen of these cells. Some of the older ones are two years old now and still hold approximately 2600 mah. What's remarkable is the relatively uniform range of capacities: plus-or-minus 50 mah, which (to me) indicates very tight manufacturing specifications and quality control. The only cells that I've found more uniformly manufactured is the Sanyo Eneloop AA, albeit in the 2000 mah range. Note: Testing done on MAHA C-9000.
Equally impressive is the moderately low discharge rate. After 3 months, the cells retain approximately 85% of their original charge. Not as good as Eneloops, but you must remember that the Eneloops start at 2000+ mah, not 2600+ mah. Relatively speaking, the Powerex 2700's are by far the most powerful cells that I've tested after 3 months sitting on the shelf. Anecdotal reports elsewhere confirm my test results.
Bottom line: If you regularly recharge your cells, say at least quarterly, then the Maha Powerex 2700's are the best rechargeable value on the market for you. And if you plan on recharging your cells just once or twice a year, it's cheaper for you to use plain alkalines. (In the 3-6 month range, you may want to consider Eneloops.)
As to the failure rate reported elsewhere, I suspect that they may be the result of overcharging the cells. Even with my MAHA C-401fs, supposedly a smart charger, I've found will sometimes exceed 1.5v. The overcharging problem is even worse with various rapid chargers. I've subsequently switched to using the MAHA C9000 to recharge cells, which consistently cuts off at 1.4v.