Deleepow Rechargeable AA Lithium Batteries 4-Pack - 1.5V 3400mWh High Capacity Double A Batteries with 2-Hour Fast Charging & 1500 Cycles - Perfect for Digital Cameras, Wireless Mice, Keyboards, Toys, and Household Electronics

1 so far is not recharging at all after its third time in a flashlight that takes nine AA's. I have bought 12 so far or three purchases of four with te charger. I have not had any trouble yet with my aaa's but give it time. We'll see. So far I'm not displeased with my order but did expect better performanceYa no volveré a comprar cientos de baterías alcalinas al año, lo que supone la inversión además del bajo reciclaje.Order this to save money and it gas saved money.I used them in the out door blink camera.Theses do NOT perform as advertised. They work but not very long. They don’t work at all in my security camera but will work in my flashlights! The charger will not charge my other brands of rechargeable AA batteries. They claim to be 3400 mah but perform as if they’re about 600 mah. I cannot recommend this product. One Star.Charger okay.Batteries are a failure, period.The charger works, a few batteries do, but (I ordered an extra pack of 4) 1 in 4 have failed in 2 uses. That's beyond disgusting. Having worked as a quality engineer, 1 is a random failure, 2 it's a systemic failure in quality. Failures in consumer items like this should be 1 in many hundreds, that it happened in first use means the items are arriving with systemic problems.I have a bunch of Energizer NiMH 2300mwh batteries and decided to try Li Ion because of the longer charge life, as well as the higher capacity rating, but mostly because they can sure in the shelf charged for a few months and still have a high percentage of charge - liked my Hulkman car jump start unit. The main intended use for these is headlamp, as in seeing where I'm walking in the evening when it's dark (street lights don't cover the sidewalks well and incoming vehicles complicate that). I want to be able to confidently put one in the headlamp, an extra one in my pocket and head out for a couple of hours if light exercise. A single Energizer lasts 5 or 6 hours on bright/high setting. Only 3 in 7 so far have gone 3+ hours, one lasted 1 hour and 2 have failed to charge back up at all. I think one didn't work at all, and I thought maybe I didn't charge it but it wouldn't charge so it must have been dead from the start.Compare that to 8 Energizers over 1.5 years with zero failures. So at least NiMH batteries don't have the awful shortcomings of NiCad batteries of before the mid 90s or so when NiMH devices came out. I used to use them for hiking in the Adirondack and Catskill mountains in long all day hikes that finished after dark (12 hours). We had only incandescent headlamps back then so the batteries drained quickly but I remember the Energizers didn't fail and they were only 1600mah as I recall. I used enough that they wore out after a few years, about the time unaffordable LEDs first appeared - and I went to other parts of the world for work reasons, but upon returning, older and less inclined to do serious hiking, switched to all (very affordable) LED lamps and new batteries. Thus the purchases. My house has Li Ion powered smoke detectors that last 19 years, and the are rechargable Li Ion batteries, so why not try them? Well, I still need to find a reliable source and it's clear that isn't Deleepow. Don't buy, wasting money.I also tried a few of each, these new ones and the existing, older, Energizers, to see how long they lasted on a charge - while I have several routes they are all about the same length, not significantly different in time (1:45 to 2:00). Given the 2300 versus well over 3000 ratings, you'd think they would show different usage times. Nope. If anything the Energizers, desire being used more and older, lasted as long or longer before fading. Oh - normal use is to only drain them 50%, and they don't need the old NiCad draining. Modern chargers, kind of like cell phones, do very low level trickle charging once the batteries are charged and I've found that the NiMH ones can safely sure in the charger for a day while at work with no harm. As for these new ones, I'm not about to check every hour or so to see the status, the multi device USB charger is in a corner out of the way (shelf space) but easy to load and use, just not as handy as the wireless phone charger is. The phone is charged a lot, daily or more, batteries not so much as I do them in pairs.So that's my take on these, only 1 star.These batteries seem to be holding up in my portable radio. Have not had to charge them yet.I've used EBL rechargeable lithium AA batteries from day one of installing my Blink security cameras. I bought this brand for the first time because of a discounted sale. I immediately noticed several bad things happen to my camera system. The live view feature would not activate, the sensitivity would not trigger, night vision was completely shut down, and when I contacted Blink support, they advised that all these things happen when the batteries are too weak. They claimed that this typically happens when customers try to be "economical" and use alkaline batteries instead of the required lithium batteries. In other words, they were suggesting that these batteries were performing no better than alkaline batteries. VERY disappointed.UPDATE AS OF 08/15/2021. After seeing this review, the seller contacted me to point out that, in fact, there was a note on the item description page that stated that these batteries were not compatible with the BLINK cameras. The seller was gracious enough to offer me a refund, even though I had exceeded the time limitation to return the item. This was really helpful and I am impressed by the proactive customer service. I almost always post a review, be it a restaurant, a car repair shop, or a purchase -- major or small. I'm glad this had a happy ending!i have received four 4ct packs of the AA 3400mWh batteries. out of all of those, i have had 7 batteries die with less than 4 charge cycles. 4 batteries died before i charged them a second time.I bought these to replace my several year old, worn out NiCd batteries that don't have much life left in them. I would trust my old batteries every day to be more reliable than these are.The charger that came with them would not show the batteries being charged. When checked with a volt meter, the batteries read 0v. I tried a different Lithium rated charger, it wouldn't show up or charge on that either. I even tried force charging it with another charged battery in parallel for a moment and still nothing.At $5 per battery, they should not be this poorly made. There must not be any quality control or anything going on with Deleepow. nearly a 50% failure rate in my experience, and seems to be common for an extremely high failure rate, judging by other reviewsThese batteries are not 1.5 Volt as advertised. They charge to 1.3 Volt max and are dead at 55% Wrote to both the Seller & Manufacturer a week ago and both have ignored my questions. Very Unhappy as batteries are very poor quality & NOT as advertised.Have switched over to lithium to operate remote blinds. These work much better than NiMh batteries. Am pleased with my purchase.