Premium Rechargeable AA Batteries, High Capacity 2500mAh NiMH AA Battery, AA Cell Battery, 12 Pack

I Have over 100 NiMH rechargeable batteries. More than half are Tenergy Premium. The others that have stood the test of time are Panasonic Eneloops. The couple dozen assorted other brands lasted at best a year. I am taken aback by the negative reviews that some people have left. It is sometimes hard to choose the right battery for the application. Some applications need wasteful throw away batteries which irks me. When it comes to camera flashes these are an excellent choice. I have three main flashes and and external and one external power pack. So I pretty much have 24 batteries in flash devices at any given time. I can't tell you why, but flash performance is the best with NiMH batteries. I have had alkaline batteries kill flashes. I don't know precisely why but that's how it is. My other use for AA's is in battery powered motion activated lights which are handy to have in poorly lit areas, I think I have 5 that take C sized batteries, for which I use AA sized NiMH batteries with a jacket around them, to make them physically the same size as C-batteries. Lastly, I have a 48 LED ring light that operates on only 2 AA batteries, and it does great with Tenergys. Maybe not 100% relevant, but I am very impressed with the Tenergy AAA's as well. I Have 3 Brother hand held label makers. They drove my first Tenergy purchase. They each take 6 AAA batteries. How long will a label maker run on AAA rechargeables? I find this amazing: I used up my first two tape cartridges and never had to recharge the batteries! They other two were for other family members, but they are happy with them too. Maybe I am making too big a deal about my good experiences with Tenergy, but when I see ten one star ratings I feel almost offended. And I have nothing to do with the company. These are damn good batteries. And I think the amount of batteries I use qualifies me to say it. If you really don't know how to charge use and store your batteries that doesn't make the batteries bad! I don't mean to be insulting but there should be no three star ratings much less a one star rating. And clearly, if you don't have specific experience with specific better batteries then I can't take those reviews seriously. If you get a damaged product, then get it replaced. If you bought the wrong type of battery for your use, that is hardly Tenergy's fault. One slight criticism: I would only say one thing I believe all rechargeable battery makers should, but seldom do, is to provide re-usable plastic boxes to store the batteries In. LOL- Do you really want 24 loose rechargeable batteries? I order clear plastic boxes, at the same time I order my batteries. Now that I think of it, Tenergy did include the boxes on some purchases because they have the Tenergy brand on them. Hey! Wassup? Start including the plastic cases again!

I originally bought my first batch of these batteries in AA and AAA sizes in 2021. I had purchased expensive Energizer and slightly less expensive Rayovac NiMH AA batteries a couple years before and was not impressed by their short life. Not short in charge life but short in the number of times they could be recharged before they failed permanently. I called both companies and was told about over-charging, high-current applications, temperature considerations, just about everything but why they failed in everyday use around the house in low current devices like flashlights, remote controls and small digital devices. So, I gave up on the national brands and bought a 24 packs of Tenergy AA's and AAA's along with their associated Tenergy 16 position AA/AAA charger and I couldn't be happier.This purchase of 24 more of each size is not for replacement of the original order but supplement to as I needed more of each. I have replaced all of the batteries in my home with these batteries and they have performed exceptionally. They are long lasting, charge well, hold their charge in devices that have a lot of stand by use (like flashlights) and I have had no failures in the 3 years of use with many, many recharges.These are superior NiMH batteries and are significantly less expensive than the natiuonal brands availble at big box stores. I heartily recommend these Tenergy NiMH batteries.

Even though only about 8 of the 52 batteries I purchased since April 2017 still take a charge, these batteries are receiving a five star rating because the reason these batteries no longer take a charge is due to an error on my part.So here is the story. I shopped around for a while in my usual detailed and systematic way and finally decided to purchase these batteries, starting with a 4 pack of AAAs on April 12, 2017. The batteries worked well, so on July 17, 2017, I purchased a pack of 12 AAs. So far, everything was just fine, but I was about to make a mistake that would lead to the eventual destruction of the 16 batteries I had already purchased - and the 36 batteries I was about to order.On December 21, 2017, I ordered a 12 pack of AAAs and a 12 pack of AAs. Unfortunately, I failed to read, and or heed, the instructions printed on the side of every one of the batteries, "Caution: battery can explode or cause burns if overcharged, disassembled or exposed to fire. Do not mix with used or other battery chemistries (alkaline, lithium). Even though I had previously habitually labeled new batteries with their date of purchase, etc., I didn't even think about it when I received the 24 new batteries, and simply put them into service with my existing batteries.By April 2018, I was increasingly disappointed with these batteries because I had already had a few individual battery failures. But I needed more batteries and didn't have time to perform new research to find a new brand, so I placed another order for 12 AAAs on April 26, 2018. The April 2018 order meant that I owned 52 of these batteries, 24 AAs and 28 AAAs. Once again, the new batteries were not labeled before being placed into circulation with the existing 36 batteries.My rechargeable batteries receive heavy use, and previously battery sets purchased at the local grocery store had provided sometimes amazing longevity (up to about 10 years), apparently because I was taking steps to ensure they were recharged regularly (at about 50% discharge). I had hoped to have similar success with the new batteries, but I had never purchased batteries in such large sets. While the differing brand, newness, and external appearance had made it easy to recognize which of my old batteries belonged together, there was no way to tell which of the new batteries had been purchased at what time.By mid-summer, 2018, the new batteries were failing at an alarming rate. Returning to Amazon to read the reviews, I hoped to find out if other customers were having similar problems and to try to figure out if I had missed reviews discussing such a large failure rate. But there were virtually no reports of failures, let alone enough failures to qualify as a rate. Disappointed and frustrated, research began to find a more reliable replacement.Then one day I happened to carefully read the second sentence of the caution warning on each battery, "Do not mix with used or other battery chemistries (alkaline, lithium)." Suddenly, it was clear that although the batteries had not been mixed with other battery chemistries or brands, 3 sets of new batteries had been intermixed with 2 sets of used batteries. Then it became clear why the batteries were failing at such a high rate, the used batteries were apparently damaging the new batteries, and or the new batteries were apparently damaging the used batteries.In an attempt to recover, I tested my remaining batteries and created sets with similar voltages immediately after charging, but the damage had been done. Today, some 20 months after the first order, only about 8 of the original 52 batteries continue to take a charge, and even these continue to fail at an accelerated rate despite the attempt to match them.Therefore, it appears re-purchasers of these - or any other sets of rechargeable batteries - should be diligent about labeling or taking other steps to ensure that new and used batteries are not utilized together to power equipment. Labeling rechargeable batteries with date, order number, tally marks, spray painting, etc. may take a few minutes, but the batteries, and money, you save will be your own.

Tenergy is a Chinese manufacturer with a good reputation because they made batteries that could be relied upon in critical applications. They still make decent batteries, but they don't quite have the advertised capacity. Batteries that they made a few short years ago did. I pulled a few batteries that I bought a few years ago out of a device, and put four of them through a refresh cycle on one of my battery charger-analysers and they had almost the capacity they had before using then for a few years, and still within the claimed mAh capacity of Tenergy's premium batteries. These new batteries after a few "refresh" or discharge-charge cycles had only two or three meet advertised mAh capacity, and the rest "close but no cigar."Compare them to eneloops or Amazon basics high capacity batteries of Japanese manufacture, and the Tenergy batteries are close, but not as good. However, bought in bulk in either the AA or AAA formats, they are a good deal. Rechargeable batteries are not cheap. But they are not throw away either. Think of them as an investment. Paired with a good Analyser-Charger that will set you back $50 to $60 and you can be using the same batteries a decade from now. Better for the environment, too. A need for batteries will always be necessary as long as you have good devices that require them.What I see, though is that in the near future, batteries will be placed in the devices you buy, and you simply recharge the devices rather than replace the depleted batteries with freshly charged ones. Think of razors with the batteries built into them, or cell phones, iPad tablets, blue tooth speakers, or any of the newer devices you are buying and using that you charge the built in batteries rather than simply replacing the batteries. So, Tenergy batteries are good batteries. And like many Chinese manufacturers have a tendency to embellish the claims they make about their products. But they make a decent product for a reasonable price.The batteries that powered the bombs used in the Boston marathon a few years ago were Tenergy batteries. That actually helped the authorities track down the brothers. You can't buy Tenergy rechargeable batteries in your neighborhood Walmarts or Targets. But go to a higher end store for hobbiests, or now Amazon, and you can find them. Functionally close to Eneloops without the much higher price.

Most of the Tenergy batteries I purchased last 10 years or more. Compare that with others that will last 300-800 charges (even when they claim 1,000). The ones that survived over 12 years old don't have the capacity of new ones anymore, but still have as much power as your cheapest alkaline or carbon-zinc (heavy duty) batteries, so are still useful. Of course, use a smart charger to make them last long. But I have used dumb cheap chargers with them too in a pinch or when the smart charger was full, but no more often than I really have to.I've never had to deliberately fully discharge these NiMi for them to hold a full charge. "Memory-effect" is much less a problem than with older NiCads. If they're run down just once in a great while... like at least every couple of years, rather than just topping them off all the time is good enough to avoid any memory effect. In another words, you may never have to fully discharge these before charging them. Over the course of 2 years of using them, you will have probably run them down low enough anyway through normal use at least once, & that should be all you need to.These aren't their low self-discharge or pre-charged versions but mine did arrive with a charge still on them. These newer formula/design ones have sat around for 3-4 months & still had plenty of charge left. So you don't have to recharge these every month or 2 if they've been setting around unused for a while. But if you want the maximum run time out of them, especially in high drain devices you really should recharge them after a couple months. Top them off before you're going on a long trip, or expecting a storm that may knock out power.Low self-discharge batteries can still hold plenty of power after being stored from a year, but don't expect these to have much power without a charging them for a year. I have accidentally left them in a low-drain LED light for about 6 months, & they still had enough power to run them for several hours (about 1/3 their normal fully charged run time).So it you're going to put these in devices that you rarely use & forget about them for more than a couple months up to a year, get their low self-discharge versions instead (they work great too).These have the advantage of being a little cheaper than low self-discharge ones, & have a higher AH (power) rating. So as long as they're used within a month or so since they were last charged, the will run longer than the low self-discharge ones.Batteries of other types will eventually leak & damage your device if they sit in them too long, get old, are an odd brand, or a factory defective battery. These will not leak ever.

I tried the cheap route first and bought the PowerOwl 8-pack battery + charger combo. It was worth it because the charger is really great, 5 stars for that, but the batteries sucked because 3-4 batteries were dead out of the box or within 30 days. I actually have a review here somewhere on those. The company contacted me and sent me replacement batteries, which was cool, and because that was cool I bought another 8-pack, but they both went 50% dead within a month too. I had similar experiences with Amazon-branded batteries. So THEN I tried the Tenergies, which were a little more expensive, and I have to say, this is a case of you get what you pay for. These batteries work great, and thus far, 6 months later out of the 24-pack there are only three that are going dead, which compared to the others is great! This is with daily use in battery-powered small garden lanterns and electronic devices like handheld game controllers.In summary, I will continue to buy Tenergy brand batteries going forward!

Good product

50/50 Shot with these batteries.I've used them for 3 months thru Christmas gifts and toys, here is what i noticed.1) The positive (+) nubs are too short for some cheaper made electronics.The Fix: Use Aluminum FOIL to bridge the gap.2) They lose charge when stored for more than a month in electronic device.The Fix: Use them in heavily used device, like kids toys. Not in remote controls or emergency flashlights please. Use alkaline there.3) They hate quick 1 hour chargers.The Fix: Use well made slow chargers. They charge to full in under 4 hours.So far... three of the 12 batteries are having a hard time pushing out good power and holding a charge. The others work ok.The best AA batteries I've ever used were 2007 metallic green Radioshack batteries!!!They worked until I had to replace them with these Tenergy batteries... in mass.Energizer rechargeable work better than Duracell rechargeable (they leaked).The Tenergy (if they work) are about the same as Energizer, but last a little longer.Also they work well with a good charger. I use a 5 year old Radio Shack and Energizer charger. They hate my 1 hour fast Radio Shack charger. I am looking for replacements for these charger like a Lenmar or Ansmann even another Radio Shack one. Its hard to find a good priced charger with conditioner built in.I still have hope for these little double AA's, because I'm CHEAP and paid MONEY for them.I have Sanyo Eneloop on order.I'll let U know how it works out :)Update:Sanyo Eneloop work better in R/C Cars. The toys are faster with Eneloop.Also the positive (+) nubs are 20% longer, equal to that of Energizer/Duracell alkaline so they make a good contact.Recharge and Usage time is the same.

To be honest they do the job haven’t had any problems been using them for a while

Speedy delivery, great pricing, item as described.

Charged up to capacity and seem to last well.Would buy more.

buenisima calidad

The batteries seem well built, I have only run them for a few cycles, but my initial feeling is they are quite good. The capacity of the cells is increasing gradually, which is expected. Overall, if these show good long term performance I will buy another pack as the value is very good.EDIT: After some time these batteries have shown very poor performance! You charge them, then a few days later, they go flat despite not being connected to anything. almost half the cells that cam in this bundle were defective and have progressively gotten worse with time and charge cycles. I would not recommend these at all. Spend money buying quality batteries, this was a wasted attempt!