The longest-lasting lithium-ion AA we've ever tested, with a unique magnetic charging cable
What We Think
The Fuvaly Magnetic Rechargeable AA is a whole new type of rechargeable AA battery. Boasting the longest battery life of any lithium-ion AA we've ever tested, this battery is a top pick. And, with a very special magnetic USB for charging, it provides a unique charging experience. Compared to traditional rechargeable AAs, it charges faster (2 hours or less) and provides a steady, higher voltage for your devices. Unfortunately, it comes with 2 big downsides:
The price: At $30 for a 4 pack, these high tech AAs are nearly three times the price of the Duracells.
The special cable: If you lose the special magnetic charging cable that these batteries come with, you cannot charge them. Other lithium-ion rechargeable AAs use a standard USB input for charging, so you can use any USB cable.
If you want a rechargeable AA that can be charged with any micro-USB cable, go with our high tech pick instead: Amptorret USB rechargeable AA
Pros
Excellent battery life
Nice high voltage (1.5V) during the entire lifespan of the battery
Built-in charging lights make it easy to know when the charge is complete
Cons
Needs a special magnetic USB cable.
Does not perform a voltage step down to at the end of its life. This means that devices with a low battery indicator will simply shut off without a warning.
Where To Buy
Amazon: Fuvaly Magnetic Rechargeable AA
Deep Dive
This is not a typical rechargeable AA. In fact, it is a small lithium-ion battery like you would find in your phone or laptop with some circuitry to mimic a regular AA all wrapped up in a AA costume. This has a distinct advantage:
Regular rechargeable AAs slowly decrease in voltage over time, causing the performance of your devices to fade. This may result in a remote control that needs to be a little closer to the TV, or flameless candle that isn't quite as bright, or a clock that runs a little slow. These special AAs though provide a constant voltage output over their whole life, allowing devices to operate just as well at the end of their battery life as they do at the start. Check it out:
Notice how the lithium-ion rechargeable battery stays at 1.5V for its entire discharge, while the Duracell Rechargeable AA (a typical NiMH battery) falls below 1.3V less than a quarter of the way in. This higher voltage may help your devices run better.
Technical Specs
The following are the technical specifications of the Fuvally Magnetic Rechargeable AA.
Summary
Capacity
You can see how it stacks up against other rechargeable AA batteries here:
