TENAVOLTS 1.5V AA Lithium Rechargeable Battery, 1.8h Fast Charge, USB Charger, Constant Output at 1.5V, 2775 mWh, 4 Count with Charger

These have really held up well over the last 3+ years compared to many other brands I've tried. They still have a shelf life of more than 6 months which isn't bad after 3 years. They have also never given me any problems after the manufacturer quickly replaced 2 AAs that had issues when I first got them. Sometimes these lithium rechargeables can have problems charging if the power drops too low for too long. The chargers just don't detect them and won't charge. Some brands will overheat while charging and take forever to charge. But I have never had these problems with Tenavolts. They also thought of simple things like having the LED light on the battery go OFF when they are fully charged rather than stay on once they are charged which begins depleting the battery power as soon as they are charged. That may sound like a "no brainer," but a LOT of lithium's have a light that stays ON, full blast, when they are charged. Those are always the bad ones that don't last. If you're going to try rechargeable lithium AAs and/or AAAs, the Tenavolts charger is a "must-have." It is a super simple charger. No fancy lights or electronics. Because of that, it will charge ANY brand of lithium AA or AAA if the battery is salvageable. I've had countless other brands of rechargeable lithium AAs & AAAs that won't charge on their own brands charger, but the Tenavolts charger will charge them. I would have had to toss out many of them if it weren't for this charger. Sometimes other brands get "stuck" and their own manufacturer's charger won't detect them. But because this charger is so simple, it will "jump start" them so the other charger can finally detect them. Then they work fine after that. And yes, it will even charge lithium's that have a USB charging port built-in, often better than the USB port.

They pack a punch until they don't, but that's how lipos work. Just a heads up no real low battery warning they just quit working. Great overall. Know what you're getting into.

If your device is well designed, it will work normally as your alkaline or NiMH battery gradually decreases in voltage. The Tenavolts are for those devices that are very fussy about the voltage. The batteries are expensive, but they perform exactly as advertised, and deliver an extremely constant 1.5 volts. And they can handle high current spikes easily. I use them in motorized Nerf blasters which are famous for eating batteries. One last thing, "Nanfu Direct". I'd never heard of the company, so I didn't know what to expect. Well, one of the 12 Tenavolts batteries I got proved defective. It took a few weeks to find this out. I emailed Nanfu through Amazon's link, explained what happened, and asked if they could replace the bad one. I got the "thank you, please allow 1-2 days for a response" message. Instead of 1-2 days, they responded within hours, apologized for the problem and immediately sent a replacement. I'm impressed. update, October 13, 2020. One reviewer felt that the battery capacity was much less than advertised. However, my batteries all test near the advertised number. The printing on the battery says "2775 mWh". My measurements of 4 batteries averaged 2300 mWh, which I think is pretty close. Some confusion may be the difference between "mah" and "mWh" (milliamp-hours vs. milliwatt-hours; milliamps and milliwatts are different). Most batteries quote capacity in mah. If the Tenavolts people had used mah, they would have printed "1850 mah" on the label (2775 divided by the voltage, 1.5). By this measure, the batteries I tested averaged 1556 mah. Not quite 1850, but not way off either.

This is one of the only battery types out there that works in my VR controllers (O+) and lasts and lasts and lasts. The only negative to that is that you don't get a depleting battery gauge, it just goes until it dies. But I believe that's because these squeeze out every last drop of power until the safety/protection kicks in. Thankfully they charge pretty fast (depending on what USB charger you plug them into). I had a full charge again in less than 2 hours. Oddly enough, the batteries themselves have a blue light on the bottom indicating charge status. While in the charger Blue on = charging; Blue off = done. The negatives I came across are: 1. You can't charge these on anything but the included charger. I tried charging in an expensive battery charger and it will either charge these for a while then just stop, or it doesn't even start charging them. I noticed rapid flickering of the blue lights on the batteries when my charger showed 99% then some stopped but others kept charging for a while. (I'm not sure if they were being charged at all because when I put them into their own charger they went for a while and stopped charging, this could be because their charger is timed and not a smart charger though, I never tested their voltage to see for sure but maybe one day I will...) The ones that stopped charging on my charger won't charge on it again.. It just doesn't "see" them at all anymore, they still seem to charge fine on their own charger though. But it makes me wary that the batteries may be damaged now. 2. Cost. These are pretty expensive for a 4 pack of AA batteries. And I'm not sure if they'll last long enough to break even vs Alkaline or vs NiMH because some of what I've read about them isn't great on the durability front. 3. No included power adapter. The back of the charger says to use a power source that is 5 volts and up to 2.4 Amps input. The manual says don't go over 5v input as it may damage the charger. Otherwise ymmv as to how long your charge takes. Otherwise that's it, they just work and none of the claims I've read from them have been misleading.

I purchased these for use in wireless microphone transmitters. I can get about 8 hours from 2 batteries per charge. That's plenty for any show I do. Disadvantages is, the battery indicator on the microphones is always 3 out of 3 bars. The indicator does not indicate capacity remaining, only voltage. I wish they made an 8 bay charger, or something more than the 4 bay and less than the 20 bay. 8/11/20 Follow up. I now have 2 of these chargers and 16 AA batteries. I use them for karaoke mics. Unfortunately, I haven't been able to use them every day since Covid to really test their durability/cycling tolerance. I'm using them in VocoPro 5800 mics. I can leave the mics on for a 4 hour show with no issues. I've left them on for a 7 hour show with no issues. They charge pretty quickly. I've never had to wait more than about 90 minutes for 4 batteries to charge. I have both chargers plugged into a 7 port powered USB hub. The chargers draw about 1.25 amps per charger. The hub is capable of 30 watts which is 6 amps at 5 volts, but I'm guessing that the charger is only capable of drawing the 1.25 amps, which is half of 2.4 amps, which is what a normal phone charger delivers to a phone. It's probably because it's charging at a lower voltage. Perhaps 1.5 volts x 1.25 amps which is just a little less than 2 watts (1.875 watts). One thing I've found is that if the batteries sit for any length of time (say, over 2 weeks) and you try to use them, they don't hold their charge. I used 2 week old batteries in a couple mics recently and they squealed out and died less than an hour into the event. When fully charged, though, with these mics, they last a good long time. At least 7 hours as stated above. 2 minuses: 1. Using with mics with battery indicators is, the battery indicators work off voltage. When the voltage decreases, the battery indicator is supposed to glow. With these batteries maintaining a constant 1.5 volts, there is no indication that the batteries are dying. They just quit. Once they dip below 1.5 volts, they just shut off. 2. They're expensive.

It’s one of the best out there for blink camera being using them for 3 years now

After two failed efforts, (semi previous review) I finally found a match that works perfectly for me. The 10 V batteries and charger. First of all the batteries. The batteries are still not quite as powerful as the ultimate lithium batteries by energizer, but, they do still pack a fair amount of power. The battery charger is rather interesting. It will only charge AA and AAA cells. The connecting cable can be any USB to micro USB connector you have. It has to be a micro USB, one with the two little pins on the plug. What the firm says is true. Batteries take about two hours to charge. I guess that, in my zoom essential recorder, the batteries are to give me roughly 8 1/2 hours of solid record time before needing to be changed. I am certainly not done buying more batteries for this charger. I anticipate buying much larger quantities both of AAA end of AA batteries. Finally found the match that seems to work perfectly.

Have been using the Tenavolts AA Lithium Rechargeables in two Blink Outdoor cameras for over a year. My experience is limited to using them 4 at a time in Wasserstein AA Lithium battery extension cases. Results have been excellent IMO. The friend who recommended these uses them exclusively (2 at a time) in all his Blink cameras, says he's tried several brands which don't work. Some ruined the camera. My cameras face a busy sidewalk and average over 75 (5 -10 sec) triggers/day each. I have 3 sets, get about 3 months per charge. No more throwaway batteries! *** Update 4/24/25 *** After nearly 3 years my original rating stands. Summer heat (95-98F) Winter cold (20-30F) average 150+ triggers/day sometimes in summer. No failures. 3 sets have paid for themselves several times over. (Reminder- am using in Wasserstein AA Lithium battery extension cases)