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!

Great batteries.

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.

They are a great value and I will provide capacity details below. Note some has a significantly lower capacity... the first time they were charged, but typically increased after repeat discharge/charge cycles. I used *EDIT* La Crosse Technology BC1000 Alpha Power Battery Charger to discharge each battery at 100mah out of the package and then charge using 200mah. If multiple charges were required, I would up the discharge/charge to 250mah/500mah respectively. Once it read full I recorded results as seen below. If the battery was below 2.0 Ah (2000mah) I would restart the discharge/charge cycle until It was over, with a few exceptions. You will see majority will meet the 2500mah capacity, even though it took some extra effort, It took me about 2 weeks to get the results, slow charging at 100/200mah takes about 16 hours or so to discharge and recharge. But bumping it up to 250/500 brought it down to 7 hour cycles Battery Capacity (Ah): # Charge 1 2 3 1 ...............2.13 2 ...............2.70 3 ...............2.12 4 ...............2.63 5 ...............1.52 2.79 6 ...............2.59 7 ...............1.77 3.49 (highest capacity, anomaly?) 8 ...............2.65 9 ...............1.54 1.61 2.84 10..............1.28 2.20 2.61 11..............1.52 1.83 2.00 12..............1.44 1.57 2.82 13..............2.70 14..............1.44 1.92 2.65 15..............2.63 16..............2.23 1.23 2.17 (Odd it got worse, then went back, but didn't try a 4th time.) 17..............1.23 2.58 18..............1.84 2.76 19..............1.35 3.13 20..............2.76 21..............1.43 2.56 22..............1.51 2.39 23..............2.96 24..............1.13 1.78 2.22 Considering the results I am glad I bought these. I have purchased a smaller pack over a year ago and they still charge well. Compared to my eneloops, rayovac hybrid, and lacrosse batteries, these fit right in as best value. If I had to put them in order of best to worst, I would say: 1: Eneloop 2: Rayovac hybrid (bought 12, 3 or 4 years ago and still hold a great charge) 3: Tenergy Premium (of the initial pack I bought over a year ago, there was one that failed to charge, the remaining charge fine) 4: La Crosse (Claim 2600mah, at first they got around 3000mah, but now i have a hard time getting them to take a charge, been 2 years.) EDIT: Corrected my charger model. Also I decided to test 4 that had been in use for a year from gaming controllers the capacity on each were 2.72, 2.87, 2.92, & 3.04 Mah so it appears they keep their charge (or get better) over time.

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.

Good product

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.

Ordered twelve batteries to accommodate three devices that use four batteries each. Since only eleven batteries are good I can only use two of the devices. If I put the other four in the third device only three of the batteries work. The fourth one will only work for a very short time before it stops. The other will not charge but to half capacity. That means it kills the device while the other three are still good. Was hoping all twelve would be good so I did not have to purchase another set just to get one battery to make a good set. As for the other eleven batteries they charge up fine on my MH-C9000PRO charger. As for the bad battery I have worked it through the "Break-in)" mode several times with no luck. The three star rating is due to the company stating their superior batteries.

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!