Mar 1, 20212 min read

Fuvaly Magnetic Rechargeable AA Review

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.