5 pcs 18650 Lithium Li-ion Battery Charger Board 3.7V 4.2V to 5V/9V 1A DC-DC Step Up Boost Module Adjustable charge and discharge + 5 pcs 18650 battery box

5 pcs 18650 Lithium Li-ion Battery Charger Board 3.7V 4.2V to 5V/9V 1A DC-DC Step Up Boost Module Adjustable charge and discharge + 5 pcs 18650 battery box

Name: 5 pcs 18650 Lithium Li-ion Battery Charger Board 3.7V 4.2V to 5V/9V 1A DC-DC Step Up Boost Module Adjustable charge and discharge + 5 pcs 18650 battery
Brand: Youmile
SKU: 543396952
Price: 2961.00 ISK
Availability: InStock
Rating: 3.6666666666666665 (3 reviews)

Product ID: 543396952

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⚡Adjustable 3.7V–5V/9V output boost

🔄Simultaneous charge & discharge at 1A

🔋5x 18650 Li-ion batteries included

Description

🔋 Boost Your Power Game with Smart, Portable Energy!

SMART LED INDICATORS - Stay informed with intuitive red/blue LEDs showing charging and standby status at a glance.
DUAL INPUT CONVENIENCE - Supports USB Type-C or solder joint input for flexible charging options.
CUSTOMIZABLE VOLTAGE OUTPUT - Easily switch between 5V and 9V outputs to match your device needs with precision.
SAFE PARALLEL BATTERY SETUP - Designed for parallel connection only, ensuring stable and reliable power delivery.
POWER YOUR PROJECTS ANYWHERE - Compact 5-pack 18650 batteries with a versatile boost module for on-the-go energy.

This 5-piece 18650 Lithium-ion battery kit includes a DC-DC step-up boost module capable of adjustable 3.7V to 5V/9V output at 1A, supporting simultaneous charging and discharging. Featuring dual input options (Type-C and solder joint), smart LED charge indicators, and a battery box, it’s ideal for DIY electronics, mobile power supplies, and portable device charging.

Reviews

S**U

Great for any 3.7v battery applications.

Very useful little chip. -: If you battery already has protection circuitry make sure to solder the two pads on the back together to bypass this chips protection circuitry...

11.08.2025

D**.

So far everything works (not true of some of the Youmile stuff).

Voltage adjustment work and the charging is also OK.

21.05.2024

J**S

Zero consistency

All 5 turned out to be rubbish 3 out of 5 didn't work out the packed absolute rip off

6.05.2025

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

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3 days ago

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2961 kr

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TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Manufacturer	Youmile
Part number	JK-YM-648
Item Weight	50 g
Package Dimensions	16.5 x 8.7 x 2.5 cm; 50 g
Item model number	JK-YM-648
Batteries included?	No
Batteries Required?	No

5 pcs 18650 Lithium Li-ion Battery Charger Board 3.7V 4.2V to 5V/9V 1A DC-DC Step Up Boost Module Adjustable charge and discharge + 5 pcs 18650 battery box

Description

Specifications

Reviews

Common Questions