4-slot USB intelligent battery charger - 18 650 lithium battery single-charging intelligent USB charging box, suitable for 21700 and 14500 lithium batteries

Feature: 
USB charging. Comes with a USB charging cable. Low voltage safe. Can be connected to a mobile phone charger. 
Charging computers and mobile power sources is both simple and convenient. 
Extension spring. The negative pole of the slot is designed as an extension spring, which can charge batteries of different specifications, such as 21700, 18650, 18490, 14500, 16340 and 10440. 
Smart protection. Utilizing intelligent integrated circuits, it automatically shuts down. Additionally, it features output short circuit protection and anti-reverse connection protection for batteries to safeguard charging and ensure charging safety. 
Housing. The outer shell is made of high-quality materials and is equipped with a  anti-lock braking system. 
The indicator light shows that the red light remains on when the battery is fully charged, and the green light remains on when the battery is fully charged or there is no load.

Specification:

Product Name: Battery Charger 
Color: Black

Category: 18 650 Lithium Battery Single-Charge Intelligent USB Charging Box 
Input voltage: DC 5V - 2A 
Output voltage: DC 4.2V 1000mA 
Charging indicator: Red light turns on during charging, and green light turns on when at full power. 
Full pressure: DC 4.17 - 4.2V 
Function: Intelligent integrated circuit control, output short circuit protection, and prevention of reverse connection to achieve protection. 
Size: For display purposes 
Regular thread length: approximately 60 centimeters 
Compatible battery models: 21700, 10400, 14500, 16340, 16650, 14650, 18350, 1850, 18500, 26700/26650, 14500, 18650 
Application: Suitable for charging products that use a single 3.7-volt lithium battery. Main products include digital appliances, beauty equipment, small fans, flashlights, smart therers, and other related products that support battery charging.

Packaging Contents: 
Single-pack battery charger

Note:

Due to the differences in display and lighting effects, the actual color of the items may be slightly different from the color shown in the picture. Thank you!

Please accept the -3 millimeter measurement deviation that may occur due to manual measurement.