Powerex AA 2700mAh Rechargeable NiMH Batteries w/holder- 4 Batteries Per Pack by Maha Energy Corporation
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Digital camera reviews of Powerex AA 2700mAh Rechargeable NiMH Batteries w/holder- 4 Batteries Per Pack
Digital camera Review: Excellent value for money
Summary: 5 Stars
What can I say? These batteries deliver the goods. I love them and will continue to use them over other "name" brands.Digital camera Review: Good for many months. Time for a new set.
Summary: 4 Stars
I got two four-packs of these over a year ago. With a baby who slept well with a sound machine, these have been great. We could leave the sound machine on all night, and we would recharge the set of 4 batteries once every few days. Night after night. We also used the batteries in our digitial cameras. I could reliably attend some family event with two pair (the cameras usually take one pair) - some pics with flash, some without flash. So, that performance is far better than Duralotacell or EnergizeMe.
I even had my wife convinced to bother to learn the complicated process (plug in Maha charger, put batteries in, the right way not the wrong way, and wait for green light). After almost a year, these stopped working. It is likely because we ran the charge down all the way - different kinds of batteries have differnt preferences for being recharged - some want to be run-down all the way, some only want to be run down maybe halfway.
So, overall, well worth the money. But once they quit working, just go get another set. I figure if you realize that you got your money's worth, and you know they will eventually get tired out, you will not be as upset as I was.
Digital camera Review: Good when new, but lifetime is short.
Summary: 2 Stars
I've purchased 4 Powerex batteries and a Maha charger, and as part of this package also got a free bonus pack of 4 AA Kodak batteries. The Powerex batteries worked well at first, but after about a year of moderate use, the batteries would not hold charge and were pretty much useless. I've tried using them in a camera and a mouse, but they either didn't work at all (camera), or just lasted for a few days (mouse). As a last resort I tried using them for backup memory in a land line phone. This is a very benign application with a very low current requirement, and yet the batteries would only last a week before completely discharging. The free Kodak batteries, interestingly enough are still going strong, in all applications, and in fact have been used in the same land line phone now for at least two months without a need for a single recharge cycle.Digital camera Review: Great Batteries
Summary: 5 Stars
These batteries are the best I've ever had. I bought two sets for my flash. My last wedding I shot over 550 pictures all of them using a flash. Even towards the end of the night while still on my first set I could shoot in continuous mode and my flash kept up with it. This would never had happened with my old batteries.Digital camera Review: High capacity battery, good in cold temperatures
Summary: 5 Stars
I have purchased over a hundred of the Powerex 2700mAh batteries in the last month for evaluation in a field instrument battery pack. About forty of the Powerex cells were compared with samples of 4 to 40 cells from other manufacturers using the Analyze mode of a Maha MH-C9000 set to 1200mA charge / 1000mA discharge, with the following results (listed by capacity):
Sanyo 2700_______2570_______95___
Powerex 2700_____2550_______94___
Duracell 2650_____2470_______93___
Ansmann 2800____2400_______86___
Sanyo 2500_______2400_______96___
Energizer 2300____2200_______96___
Tenergy 2700_____1850_______68___
Bower 3000_______1560_______52___
(note that 'pre-charged' NiMH cells like Eneloop with good charge retention were not considered for this application because of their lower capacity, although they may be better suited for some uses)
I am currently testing the Sanyo, Powerex and Duracell for charge retention during storage and for number of charge cycles (which takes a while...), but so far the Powerex is holding about 90% of its charge over two weeks.
A 24V battery pack made up of 80 Powerex cells was also tested after cold-soaking at 23 F for 12 hours, and retained about 90% of its capacity, indicating that this is a pretty good cold-weather battery too.
Highly recommend this battery so far. No bad cells found out of the 120+ tested (purchased in several batches).