» Powerex AA 2700mAh NiMH Rechargeable Batteries w/holder- 4 Batteries Per Pack

Powerex AA 2700mAh NiMH Rechargeable Batteries w/holder- 4 Batteries Per Pack Reviews

Customer Rating:
Summary: Will not keep a charge
Comment: 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.

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Customer Rating:
Summary: Simply the Best.
Comment: 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.

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Customer Rating:
Summary: work great
Comment: I bought these for a digital camera and they worked great, always lasted a full day without trouble. Now I use them with my Xbox 360 controllers, and they work equally well. I get several days from them without issue.

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Customer Rating:
Summary: Less than a year of reliability
Comment: 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.

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Customer Rating:
Summary: Powerex 2700Ah NiMH Rechargeable Batteries
Comment: These are the finiest rechargeable batteries made. I use them in my Nikon SB800 flash unit and recovery time between flashes is excellent.

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