DeleepowAA Rechargeable Batteries Lithium, 3400mWh 1.5V with 2 Hours Fast USB LCD Charger, for Household, Cordless Phones, Remote Controls, Electronics (4 Pack)

I use these in my Roland AX-Edge instead of the recommended NiMH batteries. They work fine but the battery life seems shorter than I expected.UPDATE:I ordered a second set and one of the batteries would not charge. Returned that set and ordered a third set. Initially, 2 of the third set did not charge at first but after a few minutes began to charge to I chalked it up to a fluke. 7 of this third set are working fine now after a month but the 8th battery in this set still refuses to charge at first but begins to charge after 2-10 minutes. It doesn't seem to depend on the charger position so I'm sure it's the battery. Too late to return this set but am wishing I had 1 or 2 spare batteries in case this bad one and perhaps others go completely bad at some point.

This is a 4 year review as I bought these for my son’s Xbox controller. He has charged these hundreds of times over the years that he’s had them. He told me he is still getting 4-6 hours of play time with a set. The great thing is, it’s included usb charger can plug right into the Xbox and that means he always has a fresh set to switch out whenever they die. For the cost of 4 batteries with the charger included is unbeatable in my opinion. I know he’ll be really disappointed when these finally die because you won’t ever really know the longevity of the replacement set. I’ll try these first for sure.

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!

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.