Rechargeable AA Batteries with Charger, 3500mWh High-Capacity AA Rechargeable Battery,Constant 1.5V Rechargeable Double A,1600 Cycle Lithium Batteies AA Rechargeable,Max 3A Current[8AA+1Charger]…

These rechargeable AA batteries offer impressive 3500mWh capacity, providing long-lasting power. The USB-C charger is convenient and fast, though charge retention could be better over time. A solid choice overall and great that its 1.5V so works in high power devices like battery video doorbells and RC cars

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These batteries are being used to power a ROMI robot, an aide to programming using FRC's WPILib environment. When fully charged these batteries output 1.5 VDC, and that output remains constant until nearly fully discharged. In contrast, Ni-Mh batteries only output ~1.3 VDC when fully charged, and they decline from there until effectively exhausted at maybe 0.9 VDC. The higher output and the better consistency from Li-Ion batteries is very beneficial for this application, especially for tuning PID control loops. Varying voltages will change the robot's response, making control loop tuning frustrating.Of course, other brands of Li-Ion batteries should provide the same advantage, if of equal quality, but I cannot comment on them because I only have experience with these Hixon AA 1.5V batteries, for which I have been and remain very satisfied. I would recommend them for any use benefitting from a consistent portable voltage supply.The first buy was made in June 2021, and the latest buy (to support a 2nd ROMI) was made in Nov 2023. Both purchases consisted of 8 batteries plus charger. For both orders all batteries received charged perfectly, and to date the batteries from the earlier buy have been through over a hundred discharge/charge cycles without any failures. Hixon's charger was used exclusively. Regarding battery life, the runtime in a ROMI is maybe 1.5X the runtime provided by 1900 mAh Ni-Mh eneloop brand batteries, but with the advantage of consistent performance. One disadvantage of the Hixon charger is that it only holds 4 batteries, but with two I can now utilize both in parallel, very useful since a ROMI requires 6 batteries. Even though relatively expensive, to me, these Hixon batteries have proven their worth.

First, I will say that based on claims and pretty good reviews, I purchased over 100 of these. This is because I have an absurd amount of things in my home that use AA batteries. So far I have had one that would not charge, and the company sent me 4 free, so kudos for that. But I wish I had done testing before buying so many.But... one of the first things I did was test against a Duracell in two identical 1-battery flashlights. The one with this battery stayed on fairly bright for 48 or less. The Duracell one stayed on for about two weeks before I stopped it. But of course it got dimmer and dimmer, while the one with the Hixon completely died (so brightness dropped off rapidly). Realizing they will probably NOT last as long, I was consoled thinking that, even if they only last 1/2 as long, it was still not bad because they're rechargeable.So I have put them in a variety of applications where I know how long alkaline batteries have lasted. Today I noticed they had gone too low on one item. It's under a sink on not easy to get to. But the Hixons lasted about 7 months (whereas previous tests with alkaline have lasted over two years). I put alkaline batteries back in because I don't want to have to get to them to swap them so often. Then I charged the 6 batteries in question. After a time, one of them was still not green (charged), so I removed it, only to find it was almost too hot to touch. So there's the second on that has gone bad before much of any use.Of course the reason I switched to rechargeable in the first place was environmental and economical. But I can get Duracells at Costco for under 50 cents, so buying each of these for over $5 a piece means 10 charges just to break even. I'm assuming they will last much longer than that, but still not that pleased with the 'economy' of them.They also claim that they hold a charge a very long time with only tiny loss. I have not specifically tested for this, but I do notice that when I put one in the charger, that was fully charged about a month before, it still seems to take quite a long time before the charge light turns green. I know that L-Ion batteries charge slowly as they get full, but still... it didn't seem to me that they hold a charge as well as claimed. Perhaps I will do another test sometime to tell this aspect more specifically.I have several other sets testing and will try to remember to chime back in with results on how long they hold their charge compared to alkaline batteries. But so far... not so impressed; I've spend $540 on these batteries (for 104 of them).

Very fast recycle times and plenty of life. I have 4 sets of them that I rotate in a Nissin MG80 Pro.

We use a lot of AA batteries around our household (clocks, remote controls, battery candles, PC Mice, etc.), and the expense of replacing them, (even with cheap ones) was becoming tiresome, so we made the investment in obtaining some Lithium Ion rechargeables. All of the Hixon ones that we bought have been reliable and lasted well as compared to regular batteries. Encouraged by our investment, we bought more to avoid needing to buy any more AA batteries in the future!