aa Batteries with Charger XTAR 1.5V Lithium aa Battery 4150mWh with LC4 Battert Charger (LC4+4pcs 1.5V AA 4150mWh)

I tested 4 kinds of Lithium AA batteries, and I'm putting the test results below.These batteries were the best of all 4 I tested. Highest capacity and very useful low voltage warning that all other batteries were missing.I got almost 19 hours of runtime on my Garmin Oregon 700, which outlasted all other batteries by several hours.New Xtar: Rating: 4.15Wh, Charge: 5.5Wh, 3.45Wh Usable discharge at 1Ahttps://www.amazon.com/gp/product/B0CF8ZNZ33/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1Summary:* This is the only lithium battery that drops its voltage to 1.1V to give you a low voltage warning. Other batteries I tested just die with no warning. That alone is a reason to select it. I tested it with my garmin GPS and it gave me 2H of low battery warning before finally dying. Very nice!* It is also the battery that gave me the most actual discharge capacity* Seller is not lying about cell capacity (thank you) which of course is higher than actual usable energy due to conversion losses* New charger is unfortunately bigger than the old one and drops the USB-A output feature to use your batteries as an emergency USB charger* Verdict: this is the best battery I tested and what you should buy as long as you don't need a built in charger like EBLOld Xtar: Rating: 3.3Wh, Charge: 5.3Wh, 2.7Wh Usable discharge at 1Ahttps://www.amazon.com/gp/product/B09NLVJDY6Summary:* This is the older Xtar battery. It had best in class capacity until the newer one that came out with added low voltage warning. There is no good reason to buy this battery anymore, get the new one.* Its capacity is equivalent ot the EBL battery with built in USB charging, so the EBL is more versatile* The charger is very compact and can act as a USB power source, that's a nice feature.* 10.6Wh to charge 2 batteries, or 5.3Wh charge per batteryEBL 3.3Wh rating, Charge: 4.3Wh, 2.7Wh usable discharge at 1Ahttps://www.amazon.com/gp/product/B08RZ5NDMMSummary:* There is no low voltage warning, but the battery capacity is actually equivalent to the old Xtar despite the space lost to the built in charger. The new Xtars last longer than the EBL though.* Interestingly EBLs need less energy to charge than Xtar for the same output capacity, they are more efficient* Big warning: if you try to charge the batteries via USB while they are in use, they are going to output 5V instead of 1.5V. This is unexpected and fried one of my GPSes. You cannot charge them while they are being used.Deleepow 3.4Wh rating, 3.8Wh charge, 2.4Wh usable discharge at 1Ahttps://www.amazon.com/gp/product/B09NLXQRP3Summary:* These battery are not for sale anymore, and they were the least performing amongst the ones I tested.* The 3.4Wh cell capacity is probably untrue with the charge and discharge numbers I got

The very moment I learned these exist, I had to research into them and see if it was true and if they could possibly be as good as I hoped. Turns out, yes. Unequivocally yes. All the issues I have with alkaline AND nimh batteries, all solved. These last nearly as long in most things as an alkaline battery (in my limited experience using them in flashlights and my Xbox controllers, they give me roughly the same use time as a fresh pair of Duracells), they charge in literally two hours flat, and they output steady 1.5v until nearly dead. And that's the best part. Even good alkaline batteries almost immediately drop off voltage to much less than the initial 1.5v, which means my flashlight gets progressively dimmer the longer I use it. Not with these. These bad boys are like having fresh batteries in stuff the whole time. And they even thought of the courtesy of having a voltage drop for a low battery indication, so I don't get left in the dark when it's time to swap out. I've been using Xtar brand chargers for my other Li-ion batteries for years. I trust this brand, and they've yet to let me down. So yes, buy these ones. In fact, I'm gonna buy some more right now lol 😎

I use these rechargeable batteries for my Blink cameras, and they work wonderfully. While the charge might not last quite as long as standard disposable lithiums, not having to constantly keep buying new batteries makes it totally worth it to me. The charger is easy to use, and it's a great eco-friendly and cost-effective swap for home security cameras.

Bought these in an attempt to keep a Blink doorbell happy. 6 months in and so far, so good. First pair lasted 4 months with 40+ daily events. Second pair are going strong at 2 months through freezing temps. Low battery alerts work. Much better than trying to use NiMH.They’ll only need about 5 charging cycles to break-even with non-rechargeable lithiums, so unless these fail quickly, they should be a good deal!

Coming off using EBL NiMH rechargeable batteries, these XTAR units are a dream for use in wireless microphones. I'd had such poor experiences with the NiMH that I'd gone back to alkaline, but these batteries have renewed my faith in rechargeable AAs!

Update: 1 of 4 batteries is basically dead. Drops to 1.10V fairly quick. Support is useless. "We've asked an engineer" then never get back to you. Not worth the cost over competitors and without any customer support it's basically worthless.Bought for electric toothbrush because kids seem to think they’re toys and love to play with them, eating through batteries. I noticed that 1.2v NIMH batteries would run the brush head slower so I bought these. They are holding up fine so far and came with about 98% charge as it only took about 10-15mins for the LC4 charger to show a full charge.That said, and there are YouTube and blog posts to confirm… these are noisy batteries as in electrical noise (likely due to the 3.7 to 1.5v downstep) that may interfere with radio signals like in RC cars. That was going to be my other usage but I’ll just stick to toothbrushes.Overall good batteries and charger. Simple to use. Pricing needs to drop a bit more if they’re going to see better adoption. Right now it’s not really economical to buy for every device.

currently turning out to be very good batteries that work where eneloop will not.my application won't work with 1.2v that eneloop or pro provide.I did not want to toss AA in trash ongoing so switched to these.

These batteries are great. I get tons of life out of a single pair, they're rechargable, and they deliver a constant 1.5V per battery until they reach 5% battery life at which point it drops to about 1.2V (which is still enough to give you a low battery warning on the GBC and let you know to be ready to switch 'em out). Before I used these my GBC was absolutely flying thru AA Duracell batteries. Now I have great battery life even with an IPS backlit screen and Everdrive cart. The game-changers on these are the constant voltage and the unmatched mWh/mAh rating (how long a battery lasts before it needs to be recharged).