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: Still Going Strong after more than a year
Summary: 5 Stars
I have been using the Powerex 2700mAH rechargables for over a year now, and they are still going strong.
I have been using these primarily for my Canon 580EX flash unit. I was able to shoot an entire wedding on one set, and still had power to spare (another 50-60 shots 2-3 weeks after the wedding).
I recently performed tests with these and a few other brands (Sanyo Eneloop, Maha Imedion, and Rayovac Hybrid) to determie which cells would provide the fastest recycle time on my flash. The Powerex came out on top (followed closely by Eneloop and Imedion).
Now after owning these for more than a year, I tested them for capacity on my LaCross charger (with no prior refresh cycles on these cells), and found all of these cells to have capacities between 2500 - 2590 mAH (92-95% of original rated capacity). I suspect that if I use the 'refresh' mode of my charger, I may be able to once again get 95-100% of the rated capacity from these cells.
These are by far the best standard NiMH cells that I have owned. While these are not the 'Low Self Discharge' type, they do seem to be able to hold a reasonable charge even after a month or more of storage.
Customer 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.
Customer Review: These are the best I've tried
Summary: 5 Stars
These Powerex AA rechargeables are the best I've tried.
I've tried several different brands of NiMH AA batteries (Delkin @ 2900 mAH, Power2000 @ 2500 mAH, La Crosse @ 2600 mAH, Duracell @ 2650 mAH, and DigiCam @ 1800 mAH). I use the La Crosse BC-900U charger on all of them so that I can see to what capacity they can be charged to, and even the La Crosse batteries that came with it can't be charged up to their own stated capacity. Duracell and Delkin both had a dud in each 4-pack of AA batteries. For all five manufacturers, the fully charged capacities of their AA batteries never exceeded about 80% of their stated capacities. None ever came close to a "full charge'. There was always at least one in each pack (excluding the dud in each pack) that would only charge up to about 50-60% of capacity, which would lead to a premature "Low Battery' shutdown of my camera.
The Powerex on the other hand, all charged to 95%+ of their rated 2700 mAH capacities and really last!.
Customer Review: One of the few 2700 mah nimh that keep up with the sanyo's
Summary: 5 Stars
Recently I've noticed the sanyo 2700 mah cells are failing - usually 1 cell out of 4 all matched into the same product (flash, recorder, etc). When charging you can see one sanyo cell is falling behind over time and soon hits the point where it wont take a charge and wont supply any power.
The powerex 2700 perform almost identically to the sanyos, except they do not have 1 out of 4 cells that start to die and finally won't work.
I'm actually happier using the powerex 2700 now than the sanyo and plan to convert to them as my sanyo cells die off. (I try to keep matched sets to prevent reverse discharge, so when 1 of 4 cells dies you're stuck trying to find a replacement set and end up with one good battery waiting for another failure to take the good one paired with it and make a new set if they match in capacity)
Believe me its a pain, but the advantage is you avoid the reverse charge problem.
Customer Review: Average at best
Summary: 1 Stars
I bought 8 of these to use in 2 pieces of work equipment. Each unit uses 4 batteries in series to bring the voltage up to about 5 volts. Using 3 different chargers to see if it made a difference, I couldn't get these to last more than about 3 1/2 hours. I then tried Sanyo eneloop batteries that are rated at 2000 mAh and they lasted 4 1/2 hours. If these actually provide 2700 mAh, then they do so while dropping in voltage to a point that equipment that requires the batteries to be near full voltage won't work for very long.
Since rechargeables are supposed to remain at near their rated voltage for most of a charge (in this case 2700 mAh), I think these batteries are low quality. Since this happened with two different sets of 4 batteries, I don't think I just got unlucky and got a bad battery.
Due to the expectation of high quality, and the high price, I justify 1 star for their performance.