Powerex PRO High Capacity Rechargeable AA NiMH Batteries (1.2V, 2700mAh) - 8-Pack

These are the best NiMH batteries I have used. They hold a lot of charge and last for a long time, especially when you use their C-9000 PRO charger which allows you to recondition old ones.

The tests of this, and other NiMh, on the market - indicate easily that these are best-in-class; So, I have been using the Powerex and the Imedion battery with MaHa charger for ten years now; I have discarded a few that fail to test and charge properly after a few years - and that makes the MaHa charger extremely important (it will indicate when a battery can no longer be used reliably); Cycling NiMh such as these regularly is important; And, charge them immediately before you plan to use them; Use the Imedion battery in applications where it may sit un-used for up to twelve months; Use the POWEREX in a daily or weekly-use items such as a camera flash; these are great in a camera flash such as SB600 (fairly large flash); And, the MaHa product line has many other choices; and the MaHa charger can be used on Panasonic Eneloop and any other NiMh battery. Powerex is simply the very best in mAh and long-term reliabiliy (from a ten-year user). These batteries are a very good investment, be sure to get a MaHa charger with them. The first thing you will do with your MaHa is to weed out all of your bad / weak NiMh batteries from you battery drawer and properly re-cycle them; getting rid of the 'weak link' batteries is half the battle; if you have four NiMh ina camera flash, and one of them is weak, it is the same as if all four are bad / weak, because the batteries are wired in series. If you have a suspect battery: discard it (recycle)! Also, MaHa charger can be used to sort and group batteries by their capacity; so you can choose your four very best batteries, for example, for your most critical application; I will sometimes group batteries for my camera flash or for my flashlight, as one example. MaHa also sells a D battery with an insane mAhr rating say for a Maglite or similar critical use;

They've been re-charged more times than I remember without an issue. They do not noticeably lose their charge or leak while not in use for extended periods of time. I'm very pleased with them.

The TL;DR is that I'm happy enough with the batteries that, as the rest of my other batteries come due for replacement I'm planning to switch all 30 of them to these. I've been using rechargeable AAs pretty consistently since the early 2000s. It started off mostly being for my camera flashes, but I've been using them in a lot more stuff over the years as the battery tech has improved and as I started using more battery powered stuff. But, in all that time, buying this 8 pack of Powerex Pro batteries several months ago is my first experience with the brand. For the past 15-ish years, I've predominantly stuck with using Eneloop batteries (the regular ones, not the Pro) and they've been OK for me, but now that I'm using the batteries in more devices with motors, they're just not cutting it. The Eneloops will barely spin up some of the motors when they're under load, even when they're fresh off the charger, while these Powerex batteries keep the motors working as hard as they're supposed to. And, for things like my camera flashes, while the Eneloop batteries have been OK, they've never been great because they take longer to charge the capacitors. These Powerex batteries do better there too. Battery runtime is good. As long as stuff runs long enough, which I recognize is a subjective thing, I don't really care about the specific time, so I haven't done a real comparison test. These definitely run long enough compared with all my other batteries that I'd say they're at least as good as anything I've had previously, probably better. Service life will probably be fine, but I haven't had them long enough to comment on that. But, I will say that, if you're concerned about service life, use a high-quality, slower charger. I've been using an Ansmann Energy 16 charger for about 18 years as I'm writing this and when I switched to that charger my batteries began lasting several years longer before needing replacement compared with using a rapid charger. The quality of the batteries is only one part of what determines the service life. I also pull my batteries early if I'm using them in a high-drain situation so that the heat doesn't get a change to affect their longevity as much. I don't think they're being completely honest with setting expectations for the self-discharge rate, which is to say that I don't think that, if I left the batteries sit unused for a year after being taken off the charger, they'd still be at 75%. I haven't done any formal testing to prove the numbers, but I haven't been using the batteries as much as normal this spring and after some were sitting unused for probably about 3 months, my Xbox controller indicated much lower state of charge compared with a set taken straight off the charger and my charger indicated they were below 80%. Normally, I don't let batteries sit without being used for more than a couple of weeks after taking them off the charger, often no more than a couple of days, so it's a metric that doesn't really matter to me, but it's still worth mentioning.

Have used rechargeable Powerex is various sizes for years. In the music industry for wireless microphones, body packs, etc... Always a fan of them because they have higher mAH than most other brands. Also have the Powerex chargers that work well. My only knock on them, is it seems the last few orders off Amazon for this AA Powerex, I've had problems with. Won't fully charge, batteries drain fast, etc... still using those, but wondering what the deal is?

I love these batteries! They hold the charge as advertised.

We are using these with wireless microphones. The Powerex batteries have proven themselves reliable over several years. I especially like the 2700 mAh capacity, and that they are made in Japan. They also arrive with a convenient reusable plastic storage case, and are packaged very simply (frustration free) in a cardboard sleeve. The packaging is very professional, allowing rapid deployment. We use a Titanium 16-bay charger for everyday charging, and an Opus charger to test the batteries condition. Using the Opus “quick test” feature, it is possible to match the batteries in pairs as well as weed out batteries that are performing poorly - before they can ruin your day. Because the batteries tend to go bad gradually, the only way to find them early is to use the Opus. Sometimes the bad batteries can be restored using the Opus “refresh” feature, but more often we just relegate out of spec batteries to less critical jobs. Long story short, I highly recommend these batteries!

Powerex PRO High Capacity Rechargeable AA NiMH Batteries (1.2V, 2700mAh) - 8-Pack, (MH-8AAPRO-BH) I was curious about rechargeable batteries. We have so many choices, so many price points, how do we make a choice. So I decided to do a little experiment. I ordered brand new Panasonic Eneloops (BK-MCCA). The battery claims that it holds a minimum charge of 1900 mAh. The way to think about the charge is "how big is the gas tank". The bigger the mAh, the longer a battery can last. I ordered the Powerex PRO which claims 2700 mAh and minimum capacity of 2550 mAh. I then compared them head to head. How did I compare? To compare the two sets of batteries, I purchased a sophisticated battery tester: https://www.amazon.com//dp/B000RSOV50 I set the power to 700 mA and hit charge test. What this does is that it first fully charges the battery, then discharges it completely, and then charges it again to see what the capacity of the battery is. Not an easy process. Four batteries take about 12 hours to test and I was testing 8 Powerex against 23 Eneloops. So it took a bit of patience. And what did the results show? Well, both batteries are made in Japan, and both look nice, in fact Powerex Pro is 4-5 g heavier than Eneloops and comes in a case, but what a difference in the two products. The Eneloops averaged 2030 mAh with standard deviation of 78 mAh. Only 1 of the 23 batteries I tested was lower than 1900. And that too at 1871. In fact, the Eneloops had 6% more capacity than they stated. The quality control was excellent. The Powerex PRO averaged, 1177 mAh, with standard deviation of 133. Note that the tests are identical. I took the brand new batteries and put them in the tester, just like I did Eneloops, and the results were surprising. For those of you who want statistics, I did an unpaired t test, the probability of this happening by chance is very, very small (p<0.0001) . The results tell me that Powerex is 851 mAh lower with 95% chance that it is between 772 and 930 lower. Wait, here is the surprise. I decided to refresh the batteries using a refresh cycle in the charger. Now the results came in more in line. The average power was 2532 with the Powerex, but of the 8 cells, 3 were much below 2550 minimum claim. In fact they were at 1705, 1832, and 1957 mAh. The standard deviation was 602 now. What do I conclude? Well, if you have the time to test Powerex, go for it, because you will find a few strong cells. But if you are looking for overall quality control, the regular Eneloops win. 37% of the Powerex cells were much lower than rated. <5% of the Panasonic cells were below par, and that too within margins of error. Only time will tell how these cells will hold up but this experiment tells me why some folks really love these batteries and others don't. In my opinion, Amazon choice put to the test did not hold up here. Disclaimer: I paid for these products and I do not work for any of the battery manufacturers so I have no skin in the game here. Just trying to get to the bottom of "power game" through some science.

Great Batteries. I used these for my flash when shooting weddings and they work better than any other battery Ive ever bought. Thanks!

Several years ago, I tried other brand name rechargeable AA batteries because I wanted to reduce recycling waste. The performance of these products was disappointing to mediocre. However, I have found the Powerex brand to have very good capacity and very capable of supplying high drain loads. I have used these batteries for several years now and just recently purchased enough to power all of the battery-powered devices that my family owns. I look forward to years of use before I will need to purchase another battery. I recommend this product.

Reliable. Have used some that are high-drain use and are repeatedly charged but last a good time. Have used others that are constantly trickle-charged and they last also. Have used some in slow-drain uses such as clocks etc and they also last well!

Tengo algunos meses con ellas, las compre para un vehículo de control remoto, no se descargan si están almacenadas, la carga dura bastante, las recomiendo ampliamente.

Excelente produto. Recomendo!