UltraFire Universal Li-on Battery Charger

The Ultrafire WF-139 Lithium Ion battery charger is among the most affordable intelligent dual bay battery chargers for 18650 batteries.

The UltraFire WF-139 battery charger has two independent charging bays perfect for charging 18650 batteries. Independently charge two 18650 batteries simultaneously.

It incorporates recharging technology and capabilities specifically for 18650 batteries, such as its alternating current that facilitates the perfect charging conditions for maximizing your battery life while quickly and efficiently restoring full charge.

Integrated with intelligent auto shutoff detection and overcharge protection after the batteries reach a full charge, you can rest assured UltraFire battery chargers are safe and help dramatically extend the life of your external batteries.

Ultra-fire WF-139
Battery Charger Features:

Dual-channel Li-on battery charger
Rapid charge time.
Smart CPU controls
Alternating pulse charging

Charging Specifications:

Input: AC 100-240V
Output: 4.2V / 550mA

Optional Car Adapter Available:

DC 12V / 400mA
(sold separately)

9 Reviews Hide Reviews Show Reviews

Write a Review

4
So far so...

Posted by Rich Tolle on Oct 20th 2025

So far so good. Well worth the price and works well. I've seen them on Amazon for double almost triple the price.
3
Not great but not terrible

Posted by Jess on Jan 12th 2020

It does charge batteries fairly quickly but not the best charger out there. Does the job.
5
Good Charger

Posted by Michael Jennings on Jul 23rd 2019

Everything you will need and nothing you don't to safely & quickly charge a very wide range (not just 18650's) of battery types/sizes. There are better chargers out there, but at many times the price of this one. At this price point, when comparing apples to apples, i'd say its probably the best charger I've ever used! thanks once again CV! you guys are the best!
4
Just ok

Posted by William Killham on May 28th 2019

Charges but kind of confused by the lights.lights are green when no battery’s are in it and when the battery’s are fully charged the lights are still red.for the price what can I say.fastest shipping ever
1
Bad quality

Posted by Giorgi on May 8th 2019

When I charge it heats up very much,So heats up on eggs you can fry,and does not want another back
5
nice product

Posted by Unknown on Apr 23rd 2019

The specs were a little confusing, was meaning to buy it for a tactical flashlight however wrong size battery. I did have a flashlight with that battery size though so worked out nicely.
3
Average

Posted by Roddy Engel on Feb 23rd 2019

It was a good purchase and am happy with it
5
good for the price

Posted by Norma Bishop on Aug 11th 2018

Works at least.