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: Long lasting, but does not have the 2700mAh rating
Summary: 4 Stars
It's a little odd to see these batteries rated as "2700mAh", but user rated for a 'minimum' of 2500mAh.
Of 12, 2 batteries so far are just under 2500mAh with the rest now at just over 2500mAh. I may try what Radio Control (RC) users try is a repetitive discharge/charge cycle to get some of the cells into shape, but to date have used the Break-in and refresh & analyze modes from my MH-C9000 charger. An 8-cell Maha Powerex charger is coming down the road - it's the best way to go to rotate spare batteries while some of the more time consuming charge modes are used.
I want to point out that virtually nothing these days rounds down (they all stretch numbers up): MP3 players, hard drives, etc... all stretch capacities and levels. For that reason I rate this 4 stars. That said, if ALL batteries are rated like this, then these AA batteries still are better quality in terms of how long they hold onto their charge. They have performed well above average compared to Energizer 2100 & 2300mAh batteries and Energizer & Duracell alkaline batteries I've tried in a new Garmin Oregon 400t GPS - nearly double the life!
Keep in mind: If someone were to use regular retail store NIMH batteries without a smart charger, then they would otherwise just attribute low battery life to poor battery quality or that their device is a power hog.
These batteries are high capacity in comparison to what's out there, last as long or longer compared to the competition (like industry leader Sanyo), and can also be found at national stores like Batteries Plus. They are good batteries even if they follow the crowd and "round down" with their capacity rating.
Digital camera Review: Loses charge quickly
Summary: 2 Stars
I'm a professional photographer, and I bought these batteries to use in my flashes at weddings. They recycle quickly, but I went through three sets of four batteries at one wedding. If I use eneloop, one set will last the whole day. Even my rechargeable energizer batteries last longer than these. What a waste of money. I would love to return these, but 17th Street Photo doesn't accept returns on batteries. I guess I'll just chalk it up to a lesson learned. Stick with eneloop.Digital camera Review: Maha Powerex 2200 & 2300
Summary: 5 Stars
I own the 2200 and 2300 series batteries and love love LOVE them! They are inexpensive and last seemingly forever.
Last year I helped document a project my classroom was doing for Very Special Arts. I charged up batteries and brought a spare set for just in case. I took over 1000 pictures and filled up my memory card before I ran out of juice in the first set of batteries. The other camera used to document this project ended up being the secondary camera because they kept having to stop to recharge the battery.
Because of how reliable these batteries have been I have started basing electronic purchases on if they take AA or AAA batteries or not. I have saved a lot of money because I don't have to buy spare stock batteries. I have 18 Powerex batteries that I use over and over for the past 2 years and haven't had any problems with them.
The charger is simple to work and holds the batteries to charge better than other rechargers I have owned. There is a feature to discharge the batteries should you need to do so.
I can't begin to imagine how much I would have spent on regular batteries had I not gotten these.
Digital camera Review: Maha/ Powerex 2700 mAh _4.5 Stars_a TOP performer !
Summary: 4 Stars
Top rated batteries and top manufacturer. They run at least 2xs LONGER than lower capacity (2000- 2200) mAH batts. I also compare their better performance & Run time in my previous review of the 4-pack eneloops. These quality 2700 mAh batts outperformed those 2000 mAH batteries by an Addtl ~ 48+ hrs, in [continuous] RUN time & illumination in my led string lights...
One review, elsewhere, reported these Powerex batts to be shy of 200 mAh. The (minimum) on the label reads 2500 mAh, perhaps that person tested it when not [fully] charged. NO two cells/ batts are exactly the same, but so far I've only known one @ the lowest to be down by ~60 mAh. Yet, they average above 2700 mAh.
-These batteries have been ranked TOP pick in a number consumer tests!- search ur self...
Sanyo's 2700 mAh (AA)batteries are very good too. These two brands are the true contenders(right now). I would pick 1 over the other, based on sale price or latest technology release. If I see a battery comparison on Sanyo Vs other brands w/out incl. Maha /powerex - I would question some bias present.
It's obvious that Maha/ Powerex is not as well known here, maybe b/c they're not often sold in typical retail chains. But they're no stranger in the professional shops, Photo magazines & online! - I'm saving 0.5 stars for when Maha releases an (AA) with even higher mAh!- not certain when, but fingers crossed...
----shop around 4 these- sale prices vary...
Digital camera Review: Mine too have very fast self discharge
Summary: 1 Stars
I bought about 20 of these to use in my flashes (Nikon SB800 and SB900) after reading all of these good reviews. I ignored the few bad ones. I also purchased the Maha MH-C800S charger and I use a radioshack battery tester to gauge the charge.
After only 5 months of use, say about 10-15 cycles, they do not hold a charge for very long. Even after one day it goes down to 1.1 volt. After 3-4 days they are useless. Heck the energizer batts I have from over a year ago work far better than these. If I leave them for a couple weeks they go down to 0. I mean ZERO, no charge left at all. And I use the Maha charger on slow charge, every time. Maybe they have batch issues, or quality control problems, I don't know, but my powerex batteries are useless.
In summary, I am highly disappointed in these and would advise to get any of the other name brand rechargeable batteries.