FUVALY Rechargeable Lithium Ion USB and Type-C D Batteries

Alicia A. Taylor: I have tried several brands, and this one is the best. Rechargables fail sometimes, but these have a very low failure rate compared to others. My only gripe is the new magnetic chargers are weak and the battery falls off easily. Not a big deal, not even enough to dock a star.

United States on Sep 08, 2023

Matt M: Got these to evaluate for different uses...things that come to mind are my Amazon Fire remote which seems to eat batteries even if I don't use it.

First thing -- when you charge them you have to remove the batteries from the device because letting the ends touch (including the series contacts in the devices) will short them out with the charger cable connected.

They do charge in about the expected time, and they perform surprisingly well even at very high current draw for AAA cells. I used an OPUS battery tester-charger in discharge-mode to measure the capacity and the AAA cells came out fairly consistent whether I drained them at 200mA rate or 500mA rate - very impressive maintaining 1.4V right up til the last moment even at the high discharge rate. I could see this being useful in toys or camera flashes that may go hard on batteries and run out quickly. Unfortunately the self-discharge (likely because of internal regulator circuitry) makes them less ideal choice for low draw devices like thermometers that could go for years on a normal set of disposable cells.

AAA Capacity Measurements: 358mAh, 401mAh, 370mAh, 355mAh

After sitting on the shelf (in...

United States on Dec 01, 2019

Andrew AckermanAndrew Ackerman: Fuvaly 1.5v Lithium AA 4x Rechargeable Batteries Summary

Pros:
* Lights are helpful
* Very lightweight
* 1.6v unloaded output voltage is great; 1.55v or higher, consistent and based on load
* Stays cool

Cons:
* Tested when new to 82.5% of stated capacity (1.857 Wh instead of 2.25 Wh), a little low but in the expected range
* Almost no warning when out of power. Cannot be used in critical devices where power cannot be lost.
* More expensive than 1.2v NiMH

Background
My intended use for these is for wireless Xbox controllers (2 AA) and wireless Oculus touch controllers (1 AA).

I have been using high capacity rechargeable NMHi 1.2v AA batteries for a couple years in the XBox controllers. I've tried two models, a 2800mah kind and 2500 mah turnigy brand, marked as low self-discharge.

I tested the capacity of these NmHi batteries which were good, however my xbox never showed a full battery, even when freshly recharged, and it would warn for some time that the battery was low. It was good to get the warning and have more use before having to swap them (days of use), but I felt I never got enough life out of these batteries. The...

United States on Sep 17, 2019

stv: This review is for Fuvaly Poly-Lithium AAA 1.5V battery pack (4xAAA). Color of battery is white with blue label.
Summary: Mostly positive except 2 minor cons.
Con first.
1. The AAA battery length is 0.5mm to 1mm too long.
It nearly doesn't fit my PIR night light. If you slant the AAA, completely, to slide in, won't do. My way, very snug fit: Slant just enough to compress the negative connector spring. Hold the compression then push down on the positive side. Other method: Thin out the plastic plates on ends of the battery compartment, especially the negative spring connector side.
2. You can buy about 64 premium alkaline AAA for its price. That is a lot of alkaline batteries. The good is environmental: less waste: 64xAAA garbage!
3. Because of built-in switching regulator circuit, it is electrically noisier than alkaline battery. Try it out on your audio and other devices. It may not have ill effect. The device may have good filter circuit.
Pro:
1. 1.5V constant until 'empty'! (99+% of others, Voltage will fall.)
It has buck (step-down) switching regulator in it (from 3.6V to 1.5V, regulated).
Most alkaline types, 1.5V falls to 1V when in use. So the...

United States on Jul 07, 2019