Rechargable AA Batteries (4-Pack), 3300mWh Lithium Ion, Double A Battery 1.5V Constant Output Lithium ion Double A Battery Long Lasting USB Fast Charging

Not the best. Battery life is not as advertised....Changing to 5 stars because their customer service is top notch 👌

I was glad to see that somebody finally came out with AA size Lithium ion rechargeable batteries. They measure about 1.49V fully charged, which is close enough to 1.5V to work very well in electronics that are sensitive to low voltage. I got so sick of dealing with Nickel Metal Hydride rechargeable batteries that only measure about 1.2V fully charged, so these Li-ion 1.5V batteries are a welcome change.The USB charger cord is very convenient to use, and charges very quickly.I tried to measure the actual capacity in mAh with my battery cycler, but my cycler shut down sometime after 1000 mAh due to the nature of the circuity in these Li-ion batteries lasting until they shut off suddenly. They may have made it to 1500 or 2000 mAh by the time they shut down, but i wasn't around to see it. They do seem like pretty high capacity batteries. For reference, I believe an alkaline AA battery tests at 2500 mAh (or 3000 mWh.)

I purchased these in December for my blink camera. My son installed them after we had charged them within a week the batteries were dead. I bought a second camera so I wanted another set of rechargeable batteries. That way I would have two sets of batteries for One camera and two sets for the other camera. My son put the other set in the camera and again within a week they were dead. If I buy lithium batteries that aren't rechargeables they last 3 to 4 weeks. Do not buy these batteries unless you like changing them constantly in your blink doorbell. I will be leaving another review on the second set of batteries that I bought for the other camera because the same thing is happening worthless batteries.

These Lithium Batteries seem to be the same size as the name brand and initially seem to work fine. Only time will tell regarding their longevity. I like how they use a USB C connector for charging.I use a Sharpie Marker and write the date on each battery (disposables) or a piece of masking tape on the battery cover (Rechargeable) when I install them. This helps me to tell how much the device draws power and how they hold up to similar batteries.PROs:✅ Rechargeable USB-C✅ Light weightCONs:❌ Small positive contact

I bought a two pack of these batteries for my computer mouse. They worked well at first (equivalent capacity to an alkaline AA battery while being lighter, and chargeable...), but one of the batteries died. When plugged in, the charge light stays blinking, but never reaches full (steady green). And the battery is unable to power any device it's plugged into.Unfortunate that this happened after the 1 month return window had passed.EDIT: seller offered to replace.

EDIT: changing my one star to three star review because this company reached out to me. That is an excellent sign that this is a company with integrity and good honest people. Thank you!The problem remains though, every single use of two or three at a time in a device, the device stops working because of just one of the batteries gone dead while the other(s) are still fully charged. The problem with that is the device will stop working even though only one is depleted and one is fully charged. If anyone can figure out this dilemma please let me know. Meanwhile I would buy from this company again, love you guys!Original review:I regret buying these overpriced garbage batteries. They did not hold a charge very well and then totally failed prematurely. As far as I am concerned these are junk and Iwould not recommend.

Use em for everything, great cell life!

They charge fairly quickly. they hold a charge for a long time. I use them primarily in my remotes. Worth every penny.