AA Rechargeable Lithium Batteries, 3000mWh AA Lithium Rechargeable Batteries, Rechargeable Lithium AA Batteries, 2 Hour Fast Charging, 1.5V Constant Output,1600 Cycles (Without Charger)

The original version of this review was pretty awful. Three of the batteries I purchased failed, quite literally the day after the Amazon return window closed.However, I reached out to the company.. and they got back to me within 4 business hours. They are sending me replacements at no cost at all.Sure, it would be nice if the batteries didn't fail. But they did; everyone has a bad production run now and then, right?But AmpTorrent stepped up and -FIXED- the situation by honoring their warranty and going out of their way to apologize for the inconvenience.5 Stars for the customer service alone. And the replacement batteries.

Before buying this product, I was using a lot Ni-MH batteries and charging with the OPUS BT-C3100. They worked great across multiple devices, except for one, the Cordless Battery Operated Waterpik. The Waterpik was able to run on 1.2V batteries, but it was running much weaker than alkaline. It requires 3 AA batteries and requires frequent battery replacements. I couldn't find out how much current it drew from the batteries, just know it came with three 1.5v alkaline batteries and figured maybe that's what it needs to be able to run at full power.So I researched and came across this battery from a Project Farm video. It showed this Amptorrent battery lasting the quite long among its peers and was rated for nearly exactly what it advertised.After purchasing, I learned that it is delivered at 30% capacity for safety reasons, and the OPUS charger doesn't accept these types of 1.5V li-ion batteries. The charger must be specifically designed to input 5V for Li-ion batteries. Not the 3.7V Li-ion, as these have a buck converter chip inside, and the OPUS charger will would detect 1.5V at the terminals, not realizing its Li-ion. Some manufacturers states that you have to use the same brand charger with the batteries, but I don't fully believe that, and lack of info on the web doesn't help. And so I researched again and found a Li-ion charger that appears to work for all for 1.5v AA/AAA Li-ion batteries (Doublepow - which also came with its own set of AA batteries).After charging all the new li-ion batteries, I tested the Amptorrent with the Waterpik and immediately ran into an issue. It didn't have enough capacity to get through one complete run (about 20 seconds out of 30 seconds of runtime). Turns out, of the 3 batteries, one will be warm and have nearly zero charge, while the other 2 are fine. After charging again, the warm battery appears to have failed, no led light was showing at the terminal. I left it in the charger to see if it would come back, but took it out about 2 mins after of no activity. I measured the terminals and it returned with 4V. I knew the buck converter had failed at this point. I tried again with rest of the Amptorrent and experience the same short life, but was able to recharge the last 3 successfully.I did the same test with DoublePow, and surprisingly it is working very well! It is lasting way longer than Amptorrent. It could be that DoublePow batteries were designed for higher amperage drain than Amptorrent and my use case wasn't appropriate. I'm still using the DoublePow one week in and is holding up pretty well so far.Overall, this Amptorrent AA Li-ion batteries didn't work for me. If the DoublePow fails in the near term, I think my only choice is to get the Eneloop Pros that is designed for high drain devices. But I'm holding onto hope that there is a 1.5V li-ion that can handle every device just like Ni-MH, but with better performance.

works good

One thing that bugs me about NiMH rechargeable batteries is that they don't last very long at all before they need to be recharged. I had hoped that, since these are Lithium-ion, they'd last nearly as long as alkaline batteries. They do not. They do last a bit longer than the NiMH batteries, but not nearly as long as I'd hoped.Having said that, they do output 1.5 volts when fully charged, so that's better than the 1.2V of NiMH rechargeables, and any device with a "battery meter" built in will accurately tell you the state-of-charge of the batteries, unlike when you use NiMH and it tells you almost immediately that the voltage is too low (because, again, NiMH batteries only produce 1.2V when fully charged.)TL;DR - These are fine rechargeable batteries -- definitely better than NiMH -- but still don't last nearly as long as alkaline non-rechargeables in many situations.

I bought these for Blink cameras which require AA lithium batteries. Unfortunately, these have a short life -- about 2 months -- compared to the Energizer AA lithium which lasts more than 1 year. Of course these can be recharged, but their quality is poor. In a pair one run runs longer than other. Their lifespan ydegraded quickly after a few charge cycles. These give no warning when they're "low". The built-in circuit simply cuts the battery voltage to 0. If used in a pair, one may "turn off" before the othe killing the device. Physically these are a bit longer than typical AA batteries and battery holders may be tight or have problems.Cheaper Eneloop NiMH batteries also work in Blink cameras and their life is longer than these. When using them, however, Blink immediately gives a "low battery" warning because NiMH chemistry has a lower voltage than Lithium.

First the battery came and one was dead! They replaced it and now 2 batteries are dead!ALSO these batteries aren't suitable for photography - like using them in my flash!They overheated and the flash wasn't working properly - since it can't deliver the amps to the flash!!!Do not buy these batteries!

These batteries were never that great, from the time I bought them there seemed to be something wrong with them as they would lose charge just sitting on the desk for a few days, within a week a couple of them would be almost completely drained. Now a little over 6 months later one of them is getting super hot on the + side and wont charge and I am afraid it's going to catch on fire. I'll stick to NiMH batteries for now until the tech on these lithium's gets better.

Order two packages and one wasn't wrapped in plastic like the other package and only half of them worked,contacted support and was disconnected and tried to reconnect and was sent same message over and over after answering.