Rechargeable Batteries (AA Lithium-2 Pack w/USB 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.

After going through countless batteries for my hands free toilet. After several weeks I am amazed at how much power the batteries still have. Motion sensing is perfect due to the 1.5v. If you have products that you use frequently these are a must. Great speed while charging. Great performance. Bring another set for my Xbox controllers.

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.

I use them in an xbox controller, mouse, and Reverb G2 VR controllers. They work very well and last a long time between charges. I probably charge them once every other week with my usage, as I like to keep them charged up before they give out during a gaming session. One issue I've had is that 1 out of the 8 I have purchased has become "lose" on the inside. When I move it back and forth gently in my hand I can hear something moving around inside. This has become evident when using this battery in VR controllers. The movement of the controller is like moving it in my hand. As soon as the internal connection loses its grip, the controller shuts down immediately. this means I can no longer use this battery. I will try to get in touch with the manufacturer to see if they can do anything about this defect. I do not drop my controllers or move them excessively, so I feel the battery should be able to take the movement I have put it through. I hope this can be fixed. I'll provide and update if it can. Otherwise I would probably not buy more of these since they are expensive unless I actually get to use them for their full expected lifetime.

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.

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.

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.

These batteries are absolutely brilliant. They look like AA batteries, but inside each one is a 3.7V 750mAH lithium ion cell and a voltage regulator. The voltage regulator takes the 3.7V output from the li-ion battery and steps it down to 1.5V and *keeps* it there until the internal cell drops below operating voltage spec (usually around 3.3V). At which point, the voltage regulator drops the voltage from 1.5V to 1.1V, enough for most devices to trip the "low battery" indicator. As for the longevity, I can honestly say that I have no idea how long the batteries last. I bought the set of four AA batteries with the charger and I keep that in my bag with my PowerA Wireless GameCube controller for Switch. I play Smash Ultimate about 4 hours a day for 4-5 days a week (not competitive, I just really like the game) and rotate the batteries out each day (use batteries 1 and 2 on Day 1, batteries 3 and 4 on Day 2, 1 and 2 on Day 3,you get the idea). I charged all four batteries to full back in February and decided to see how long they would last. I haven't charged them since. For comparison, the same amount of playtime on standard alkaline batteries is around 80ish hours (batteries that came with the controller at 1.6V gave off the low battery warning after a month and reported 1.15V on my multimeter). The last NiMH batteries I tried in these controllers were Eneloops, but those always gave me the "low battery" indicator on the controller. The price is a bit steep, but considering each battery has gone through about 240 hours of gaming without a hiccup, I'd say it's well worth the money.

Entspricht den Erwartungen.

Confezione, qualita' e prime impressioni molto molto positive. Dai test su internet sono di medio alto livello, la giusta soluzione per avere batterie ricaricabili ma con voltaggio da 1.5V. Inoltre unica marca seria al momento ad avere la versione AAA. Quando cariche il LED blu si spegne.

This product is so somple to use and it works perfectly.

J'utilise les piles rechargeables pour les caméras de surveillance blink de chez Amazon. Cela fonctionne bien même si au niveau longévité je dois les changer environ toutes les trois semaines ce qui est un peu plus qu'avec les piles non rechargeables par contre les économies se feront sentir rapidement une fois le prix d'achat amorti. A voir cependant sur le long terme.

Been using these for about 4 years now for blink camera still holding a good charge