Tenergy Premium Rechargeable AAA Batteries, High Capacity 1000mAh NiMH AAA Batteries, AAA Cell Battery, 60 Pack

These rechargeable batteries are reliable and long-lasting. They fit just like a regular battery and they work perfectly. I love using these for string lights and stuff that tends to kill normal batteries quickly. These are convenient and economical.

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.

Reliable rechargeable battery at a good price.

I agree with most of the posts but thought I would include a tip. I am using these batteries in under mounted LED lights that mount underneath my kitchen cabinets. After the lights used all the energy from the battery I placed it back into the Tenergy charger to recharge... But the charging battery icons would not come on and the battery would not charge. How frustrating! I almost threw the batteries away. But I did some quick research and discovered that their is built in protection that makes the battery play totally dead. To get the battery to charge again grab a 9 volt battery or other larger battery and connect paperclips or a wire etc to both ends of the 9 volt battery and the Tenergy battery. This higher charge turns the internal protection off and allows the battery to charge normally again. I took an old 9 volt connector with the red and black wires and cut them out of an old device. I connect the black top that snaps on to the 9 volt battery and touch the red wire to one side of the Tenergy battery and the black side to the other. You only have to touch both sides for a second before they start accepting a charge again. Hope that helps someone! I only wish the charger would automatically provide the higher charge that would allow the batteries to start charging instead of using this manual process. But I was happy I can resurrect them myself instead of throwing them away.

These have saved me money. I’ve had them almost 2 years and recharged them countless times and they still recharge to full strength. I’m using them in small puck lights that tap on and off that I use in closets and dark cabinet corners so some get a lot of use while others just maintain the charge without much use. Either way, I’m impressed with how well they work and have held up. I just reordered another set to use in my other electronics after seeing how well they’ve held up in the puck lights.Of course they need to be recharged periodically depending on use but then they’re good as new again. Definitely a cost savings and worth the small effort to recharge them when needed as it maintains the full brightness of the lights that way. The puck lights I use are inexpensive plastic and not the most exacting specifications, but I’ve never had an issue with these batteries fitting in the space allotted to them. The manufacturer did a good job with these.

I got these for my firehouse radios, and they work perfectly. The radios were unication g1 pagers. Make sure you check the amperage and voltage of the original batteries you are trying to replace.

I have these expensive in ground solar brick lights I installed in a hardscape. First set of 4 bought in 2010. Even with new batteries 3 of 4 just stopped working. I bought a new set of 4. These solar bricks are not your average plastic solar path lights. Anyway, I was so disappointed with this new set. The lights did come on at dusk but only stayed on for 2.5 hours. Before I returned them I thought perhaps it was a problem with the generic batteries the manufacturer uses. I purchsed these Tenergy batteries. Wow! Now these solar brick lights come on at dusk and stay perfectly bright all the way until dawn. More than 12 hours (in California in December). During the day the sunlight re-charges them. Beyond impressed!

My grandson has many many toy train engines that need batteries. These rechargeables meet the bill. Make sure you get a suitable battery recharger for these and charge before use.