Powerex AA 2700mAh Rechargeable NiMH Batteries w/holder- 4 Batteries Per Pack
by Maha Energy Corporation
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Digital Cameras Photo Reviews of Powerex AA 2700mAh Rechargeable NiMH Batteries w/holder- 4 Batteries Per Pack
Customer Review: My experiences with Powerex 2700
Summary: 5 Stars
I've only had these for three months now. I've used them in two cameras. The Canon powershot sx10is, and my powershot A710is. I just got back from Walt Disney World. I shot a lot of video using the sx10is. I recorded entire shows/parades etc. No failures experienced.Shot all that video, and still had plenty of juice to take flash pictures. The sx10is has a monster zoom as well, so there's another bite out of the batteries as well.
I've taken quite a number of pictures and video since owning these. What I also find refreshing is not finding them dead after a short space of time while not used. Finding dead batteries started to be common with another manufacturer I won't name. I also use these batteries in my portable bearcat scanner. I've gotten around 16 to almost 17 hours of continuous on time out of these powerex batteries.
I have two of the Powerex eight cell smart charger. Since all I use are AA batteries, this charger is ideal for me. When I bought these batteries, the very first thing I did was condition them. Based on the results i'm getting, i'd say that's the way to get started.
I've read some of the reviews here. It's not my intention to question anyones negative experiences here. Sometimes things just don't work as well as they should. That happens unfortunately. As far as longevity goes, my experiences with batteries like these is, they only have a limted life span. (like us, only shorter) They can only be charged/discharged and charged again so many times. I feel that if I can get a complete year of this kind of performance, then I feel i've gotten my money's worth. Digital cameras are extremely power hungry and put one heck of a drain on batteries, or so it sure seems to me. Overall, so far, i'm happy with the performane. If things turn sour, I will update this review to tell you. I've eaten crow before. Just pass the salt if I come back with bad news.
Customer Review: These came out the winners
Summary: 5 Stars
I was looking for a good rechargeable battery with at least 2000 mAh. I decided to buy eight each of the following three types of batteries:
Duracell DC1500B4N Rechargeable AA NiMH Batteries (2650 mAh)
Powerex AA 2700mAh Rechargeable NiMH Batteries (2700 mAh)
Sanyo Eneloop AA NiMH Pre-Charged Rechargeable Batteries (2000 mAh)
I'm posting this same review for all three batteries.
I also bought a La Crosse BC-9009 battery charger (which, apart from the manual, is quite excellent). This charger gives you the option to test battery capacity, so I used it on the 24 batteries that I bought. Granted, a sample space of 24 batteries is quite small, but it's good enough.
The Duracells came in at 1547, 1399, 951, 2200, 2220, 2180, 940 and 905 mAh for an average of 58% of rated capacity (avg. 1543 mAh / 2650 mAh).
The Powerex came in at 2620, 2560, 2570, 2630, 2440, 2470, 1318 and 1053 mAh for an average of 82% of rated capacity (avg. 2208 mAh / 2700 mAh).
The Sanyos came in at 1940, 1867, 1931, 1961, 1856, 734, 1786 and 1895 mAh for an average of 87% of rated capacity (avg. 1746 mAh / 2000 mAh).
Although the Sanyos 87% is better than the Powerex's 82%, the powerex comes out better from a cost perspective. The Duracell's were not even in the running.
In September 2009, for 8 batteries, the Duracells cost me $22.22, the Powerexs cost me $25.98 and the Sanyos cost $24.41.
Based on this, the Powerex's cost $1.47 per Ah. The Sanyo's were $1.74 per Ah and the Duracells were $1.80 per Ah.
Given all this, I'd say the Sanyo's were decent, the Duracell's were losers, but when I need more batteries I'll stick with the Powerexs.
Customer Review: WORST BATTERIES EVER, NO QUALITY CONTROL
Summary: 1 Stars
I have worked with batteries all my life and these are the worst. After a full charge, 900 mA rate, in a "Wizard One" charger, I set aside 16 powerex cells for 10 days. Then I recharged them in the same charger at the same 900 mA rate, to see how much charge would be required to bring them back to full charge. The best one took 162 milliampere hours of charge, not bad. The worst one took 882 milliampere hours, awful. Remaining cells were: 163,346,384,401,430,473,476,489,578,654,668,669,672,806. This leakage throws a battery pack out of balance in a day, due to the wide range of leakage rates.
Now let's look at two types of precharged cells:
Duracells with a 2000 MAH rating, only required 76 to 95 milliampere hours to fully charge after 31 days on the shelf. The other two sample cells came in at 85 and 86 milliampere hours. After 31 days the Powerex are quite dead.
Rayovac's Hybrid is higher in leakage, but still very nice. After 31 days they required a recharge of 178 to 192 milliampere hours. Note that in the precharged cells there is not much variation in leakage.
I would avoid any cell that is not precharged. A bad precharged cell will be "dead on arrival" given shipping time, thus giving itself away at once. Although they have a lower capacity, they always give a longer run time in my flashlights, DVD player and run clocks for as long a seven months.
I have been using 28 hybrid cells for a variety of things and have no complaints after several months.
Customer 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).
Customer Review: MAHA 2700mah clocking in at ~2200mah or less!
Summary: 1 Stars
We purchased a large quantity of these batteries for work to supply to customer sites. The batteries have been cycled through the Lacrosse BC-900 at 1A each on Refresh. It usually takes about 2 days to be finished on refresh.
I've spot checked several dozen and they're all significantly low on the capacity. They've got 'great' reviews, but so far we're not seeing it. Many of the batteries arrived at <0.84V, which requires a jumper trick to bring them back.
Worst of all is their self discharge rate. With at least 100 batteries out in the open in 4 pack containers within a 1.5 weeks they're down to 1.1V, and after that down to 0.95V. Useless.
Now I've previously reviewed Tenergy LSD cells, and while their rated capacity is not as high they're delivering actual capacity better than these MAHA Powerex cells. Better still, they're holding their charger longer than the MAHA Powerex cells.
If you leave batteries on the charger 24/7 (not a good idea) then these are a great choice- yank them off and stuff them in your flash. But if you don't, please consider getting an LSD cell (low self discharge). It's worth the extra money (or not, depending on brand).