Customer Reviews

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

5 star:		(36)
4 star:		(2)
3 star:		(2)
2 star:		(7)
1 star:		(9)

 

 

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!.

I purchased 4 packages of these batteries to use in my electronic flashes at a wedding. One set of charges AA batteries got over 300 flashes on my Nikon SB-600. This is over double the expected number of flashes that are expected according to the Nikon owners manual. These batteries are the best NiMH batteries I have ever used (and I've been purchasing many brands over the years.) They also have an excellent shelf life which I have never seen in other brands of NiMH batteries. In short, if you need rechargeable AA batteries, just buy these. You won't be sorry.

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.

I use these batteries to power my headlamp while vertical caving, and I wouldn't trust this job to any old battery. Thus far, these have been the best rechargeable AA batteries I have ever used. They hold a charge and last longer than any brand I've tried.

I have had 3 sets of Powerex rechargeable AA batteries and all have lasted less than a year. While they hold a high level of charge (and last long in my cameras) at first, within 6-9 months of occasional use the time they could hold their charge got shorter and shorter. (I'm using a LaCrosse BC-900 charger, reputably one of the best -and kindest to batteries- on the market)

I have converted to Sanyo eneloop batteries, which work much better: they hold their charge longer, even after 18 months of regular use... and they hold their rated voltage longer through use so you get the full benefit of every charge. Don't let generally lower mAh rating fool you (they usually are rated 2000 mAh compared to 2700 for the Powerex), they give you a much more useable charge, over a much longer life.

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.

These batteries last longer on a charge, with the best recycle time than any other batteries chargeable or not, that I've ever used. Highly recommended. For best charge, be sure to use the Maha charger. It makes all the difference. The other chargers just didn't do a great job.

Best recharge-ables I've bought thus far. 5 set purchased. I use them in my wii remotes, remote controls, front door key pad, kids games, remote cars, etc. Have recharged them dozens of times - no failure, while other brands have, Only one draw back to these, they don't last incredibly long in my furnace keypad - but I think this was due to me mismatching a different type of rechargeable battery with 2 of these. The other failed (Ultra pro NiMH) withing 1 month and the voltage level was no longer high enough. I have since replaced the faulty battery with another powerex and all is good so far. Try your best to match up all the batteries the same. The ones in my front door key pad have been in there for over a year now, on the same charge. Hope this review was helpful

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.

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.