Efan X4 Charger Review

2 posts / 0 new
Last post
LumenMax's picture
Last seen: 2 days 5 hours ago
Joined: 08/21/2018 - 10:50
Posts: 376
Location: NY
Efan X4 Charger Review

YouTube Efan X4 Introduction:

Sample provided by Efan for revie. They included 4 IMR 18650 3.7V 3500 mAh batteries (25A max).






X4 Universal Battery Charger Features from Alibaba's list:


• Provides 4 (0.25A/0.5A/1A/2A) optional Charging Modes
• Capable of charging 4 batteries simultaneously
• Each of the four battery slots monitors and charges independently
• USB output function with supply power for mobile devises 
• Compatible with and identifies Li-ion (20700,21700,26650, 22650, 18650, 17670, 18490, 17500,
18350, 16340(RCR123), 14500, 10440), Ni-MH and Ni-Cd (AA, AAA, AAAA, C) rechargeable batteries
• Optimized charging design for IMR batteries

X4 Universal Battery Charger Specifications:

Input voltage DC 12V 2A
Charging Current 0.25A/0.5A/1A/2A
Output current ≤55 mA
Output voltage 4.2±0.02A
Output current 375mA × 4 / 750mA × 2
USB Adaptor Type US /EU /UK/AU
Car Charger FREE
Weight 550g (without batteries and power cord)

Compatible with: 20700,2170026650, 22650, 18650, 17670, 18490, 17500,


18350, 16340(RCR123), 14500, 10440), Ni-MH and Ni-Cd (AA, AAA, AAAA, C)  rechargeable batteries.

I thought it was nice that Efan includes a US/EU wall plug and a car plug.



The X4 has a USB discharging ability. In order to use the X4 has a power bank, you will need at least one 18650 or greater battery inserted into one of the slots and the power cable must be unplugged. It charges devices at @5V and @1A. I see this as a bonus feature, but not as a secondary feature since it wasn't designed specifically as a power bank (e.g., no cover to keep the batteries from popping out inside a backpack). I support you could just wrap a rubber band around the batteries to keep them in place, but that's not so elegant.


For aesthetics only and not real vents for heat dissipation, but honestly, the charger doesn't get hot enough for me to worry about overheating issues at 2A charging mode.


A US/EU wall plug and a cart charger is included. Nice.


You can insert an 18650 battery in, select 2A mode, but as soon as you insert a 3rd battery in, the mode automatically drops to 1A.

So far, I'm pleased with this charger.


Edited by: LumenMax on 12/09/2018 - 21:26
Sarah Efan
Sarah Efan's picture
Last seen: 2 years 3 weeks ago
Joined: 12/12/2018 - 22:05
Posts: 31
Location: China

Appreciated for reviewing Efan X4 intelligent Charger, dear Lumen.

Sarah Efan

Efan(Eizfan) li ion/IMR battery & charger, Around 10 years professional manufacturer

Email: sales55@efanbattery.com
Web: www.yifangpower.com
Alibaba: https://yi-fang.en.alibaba.com
Skype: efan.sales5
Facebook: Sarah Efan
Wechat: efantech4