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CE Certified 3.7V 400mAh Lithium Polymer Battery Lipo Battery 402540 Size for Humidifier and Beauty Instruments

Name: CE Certified 3.7V 400mAh Lithium Polymer Battery Lipo Battery 402540 Size for Humidifier and Beauty Instruments
Brand: Shenzhen Vats Power Source Limited
SKU: 402540
Price: 7.76 USD
Availability: InStock

Brand Name:	VATS Battery or Netural
Model Number:	402540
MOQ:	3
Price:	CN¥6.76-10.35

Detail Information

Product Description

Ratings & Reviews

Detail Information

Place of Origin:

Guangdong, China

Battery Size:

4*25*40mm

Weight:

Type:

Li-polymer

Voltage:

3.7V

Capacity:

400mAh

Charge Voltage:

4.2V

Cut-off Voltage:

2.75V

Std. Charging:

0.2C

Max. Charging:

1.0C

Max Discharge:

1.0C

Anode Material:

LCO

Charging Ratio:

Discharge Rate:

Operating Temperature:

-20~60°C

Self-discharge Rate:

<3% Monthly

Highlight:

3.7V 400mAh Lithium Polymer Battery

402540 Size Lipo Battery

CE Certified Li-polymer Battery Pack

Product Description

CE Lithium Polymer Battery 3.7V 400mAh 402540

High-quality CE certified lithium polymer battery designed for humidifiers and beauty instruments. This 3.7V 400mAh 402540 model offers reliable power with advanced safety features.

Product Specifications

Product Name	Polymer Lithium Battery	Model	402540
Voltage	3.7V	Capacity	400mAh
Charge Voltage	4.2V	Cut-off Voltage	2.75V
Std. Charging	0.2C	Max. Charging	1.0C
Warranty	12 Months	Certification	ISO9001/CE
Application	Beauty Instrument	Samples	Support free samples

Battery Quality Features

Grade A cells ensuring high and full capacity performance
Dual IC chip protection against over-charge, over-discharge, over-current, and short circuits
Injection technology for enhanced battery stability
Long life cycle for extended product durability

Technical Characteristics

Customizable sizes, models and capacities with thickness range from 1 to 12mm
Wide capacity range from 15-10000mAh
Built-in BMS or PCB protection for over-charge and discharge safety
Lightweight design: 1/3 weight of lead acid batteries, 70% size/weight of Ni-MH/Ni-Cd batteries
Customizable voltage, capacity, and mating plug/connector options
Wide operating temperature range: -20°C to 60°C
Steady performance with high power output and low self-discharge rate (<3% monthly)
No memory effects with highly efficient charging capability
Environmentally friendly green product with no pollution
Short delivery times with comprehensive service support

Packaging & Shipping

We offer multiple shipping options to meet your needs:

HK UPS: 4-6 days delivery
Air Cargo: 7-10 days delivery
Sea Shipment: Approximately 1 month delivery

With 10 years of experience and trustworthy forwarder partners, we can arrange sea, air, and express transportation efficiently.

Application Areas

Civil consumption: digital cameras, MP3/MP4 players, PDA, electronic dictionaries, e-book readers
Electric tools: saws, electric drills, and power tools
Small household appliances: portable vacuum cleaners, electric mops
Electric toys: remote control toys, model boats and ships
Electric vehicles: electric bicycles and cars
Lighting: emergency lights, solar lights, LED lights
Beauty and health care: electric beauty devices, hairdressing tools
Medical devices: portable electronic medical equipment, hearing aids
Other applications: instruments, GPS devices, access control systems

Our Certifications

Company Information

Our Services & Strengths

ISO9001:2015 certified factory with strict environmental controls
Comprehensive quality assurance using high-quality materials and 100% production inspection
Professional R&D center offering customized size, capacity, PCM, wires and connectors
Low MOQ with strong production capacity and fast dispatch options
Authorized international certifications meeting global standards
Excellent service system with quick response times and 12-month warranty

Production Process - Workshop

Our facilities include water purification systems, research & test labs, plate workshops, cell workshops, capacity grading stations, and PACK workshops.

Production Process - Equipment

Advanced equipment including mixing LDH-60L, coating machines, calenders, formation/capacity grading systems, auto-injection machines, and winding cell equipment.

Customization Services

We specialize in custom battery solutions. Contact us directly to confirm necessary parameters for a customized battery design.

High standard quality management system with ISO9001:2015 and TUV-UL depth certification
We provide not only batteries but also comprehensive solutions for our customers

Why Choose Us

Frequently Asked Questions

Q: How about the warranty of li-ion batteries?

A: Warranty of li-ion battery can be as long as 1 year.

Q: Do you have current sample in stock?

A: We usually have stock for battery cells. For battery packs, we can finish samples quickly once order is confirmed.

Q: Can I have a sample order?

A: Yes, we welcome sample orders and offer OEM/ODM services with customization available.

Q: What's the delivery time for mass production?

A: Usually 25-30 days, depending on quantity, material, and battery cell model.

Q: What kind of certificates could you provide for the battery?

A: We can apply for CE, UL, UN38.3 and other certificates. Certificate fees apply for custom designs.

Q: What is your quality control process?

A: We are ISO9001 certified and perform 100% inspection on all batteries before delivery.

Quick Response Contact

Contact: Lynn

Mobile/Skype/Whatsapp/Wechat: +86 13476615395

Tel: 86-0755-86909458

Web: www.vatsbattery.com

Ratings & Review

Overall Rating

5.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

100%

4 stars

3 stars

2 stars

1 stars

All Reviews

Robert T.

United States May 13.2026

Helpful (99)

As a veteran engineer in portable audio and smart hardware R&D, I demand the absolute best in battery electrical performance. We sourced this 103048 3.7V 1500mAh Li-polymer battery for a BT speaker project, and its real-world performance has completely blown us away.

c*o

Australia May 4.2026

Helpful (88)

xxx

Mark

United States Jan 7.2026

Helpful (120)

Really happy with this 14.8V 2000mAh 18650 battery pack! It fits my power tools perfectly and was easy to install right out of the box. Charging is fast and it holds power really well during daily use. The built-in PCB protection gives me extra peace of mind for safe operation. The output power is steady, no sudden drops while working. I’ve used it for hours straight on my drills and wrenches, and the performance stays consistent. For the price, the quality totally beats my expectations. Shipping was quick too. If you need a reliable replacement or spare battery for power tools, this one is absolutely worth buying. Great value overall!

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products details

CE Certified 3.7V 400mAh Lithium Polymer Battery Lipo Battery 402540 Size for Humidifier and Beauty Instruments

3.7V 400mAh Lithium Polymer Battery

402540 Size Lipo Battery

CE Certified Li-polymer Battery Pack

Overall Rating

Rating Snapshot

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