21V 3A 63W 5S Lithium Battery Charger with 5.5×2.1mm or 5.5×2.5mm DC Connector

Product Overview

The 21V 3A 63W 5S Lithium Battery Charger from Guangdong QINX Technology Co., Ltd. is an AC/DC desktop battery charger designed for compatible 5S lithium-ion battery packs requiring a regulated 21V charging output.

A 5S lithium-ion battery pack has a nominal battery voltage of approximately 18.5V, while a fully charged 5S Li-ion pack reaches 21V. This charger is therefore configured for 5S lithium-ion battery charging applications where a 21V CC/CV charging output is required.

The charger provides up to 3A / 3000mA charging current and a maximum output power of 63W. Its CC/CV charging method provides controlled current and voltage during the charging process.

The universal 100–240VAC input supports use across different international markets. The DC output can be configured with either a 5.5×2.1mm or 5.5×2.5mm connector, providing flexibility for equipment with different DC charging interfaces.

With compact dimensions of 115×50×32mm and a weight of 0.21kg, this charger is suitable for applications where a relatively compact desktop charging solution is required.

Customers evaluating different lithium battery charging configurations can also review the AC/DC battery charger product range for related charging solutions.

Key Features

• 21V DC charging output

• 3A / 3000mA maximum charging current

• 63W maximum output power

• Designed for compatible 5S lithium-ion battery packs

• CC/CV charging method

• 100–240VAC universal input

• 5.5×2.1mm or 5.5×2.5mm DC connector

• 1.2m output cable / customized

• Compact desktop enclosure

• Energy Efficiency Level VI

• OVP, OCP, SCP and OTP protection

• 115×50×32mm product size

• 0.21kg product weight

• OEM and ODM customization support

• Voltage, current, connector, cable, labeling and packaging customization available

Technical Specifications

Energy Efficiency

The charger is designed for efficient AC/DC power conversion and supports Energy Efficiency Level VI.

The universal 100–240VAC input allows the same basic charger configuration to be considered for different international markets.

For OEM projects, efficiency requirements and standby-power considerations can be reviewed during the specification stage according to the target market and application.

Applications

The 21V 3A 63W charger is designed for compatible 5S lithium-ion battery packs and electronic equipment requiring a regulated 21V charging output.

Potential applications include:

• 5S lithium-ion battery packs

• Portable electronic equipment

• Rechargeable consumer electronics

• Battery-powered equipment

• Rechargeable tools

• Small industrial equipment

• Portable equipment requiring 5S Li-ion battery charging

The actual charging compatibility should be confirmed according to the battery chemistry, cell configuration, BMS requirements, battery capacity, charging current and DC connector of the target system.

Guangdong QINX also provides power solutions for battery-powered equipment and related electronic applications. Battery-powered equipment applications can be reviewed for broader application categories.

Connector Options

The charger is available with two standard DC connector options:

• 5.5×2.1mm DC connector

• 5.5×2.5mm DC connector

These barrel-type DC connectors are commonly used on electronic equipment and battery-powered systems.

For OEM projects, the connector configuration can be reviewed according to the customer's equipment interface.

Possible customization options include:

• DC connector type

• Connector size

• Polarity

• Cable length

• Cable configuration

• Connector assembly

The final DC connector specification should be confirmed before production to ensure compatibility with the customer's equipment.

Protection Features

The charger includes the following standard protection functions:

OVP – Over Voltage Protection

Over Voltage Protection helps protect the charger and connected equipment against abnormal output-voltage conditions.

OCP – Over Current Protection

Over Current Protection helps limit abnormal output-current conditions during operation.

SCP – Short Circuit Protection

Short Circuit Protection helps protect the charger in the event of a short circuit at the DC output.

OTP – Over Temperature Protection

Over Temperature Protection helps protect the charger when the internal operating temperature exceeds the designed protection range.

Actual protection behavior depends on the specific product configuration and operating conditions.

OEM & Custom Solutions

Guangdong QINX supports OEM and ODM projects requiring customized lithium battery charger configurations.

Customization options include:

• Output voltage customization

• Current customization

• Cable length customization

• DC connector customization

• Label customization

• Packaging customization

For projects requiring specific charging specifications or connection configurations, customers can discuss custom lithium battery charger solutions with Guangdong QINX.

Product Development Support

Specification Review

Project requirements can be reviewed before prototype development, including:

• Input requirements

• Output voltage

• Output current

• Output power

• Battery chemistry

• Battery configuration

• Charging requirements

• DC connector

• Cable configuration

• Target application

Prototype Support

Prototype samples can be provided for initial electrical, mechanical and system evaluation.

Testing

Prototype testing can be used to evaluate charging performance, output stability, connector compatibility and system integration.

Sample Validation

Prototype samples can be used for:

• Charging testing

• Output verification

• Connector verification

• Battery-system testing

• System integration

Where applicable, the final charger configuration should be validated together with the customer's actual 5S lithium-ion battery pack or end equipment.

Engineering Support

Guangdong QINX provides technical support during specification confirmation and product customization.

Support may include:

• Electrical specification review

• Output adjustment

• Connector selection

• Cable configuration

• Product configuration optimization

This support helps OEM customers align the charger configuration with their final battery-powered equipment.

Manufacturing Capability

Requirement Analysis

Guangdong QINX reviews project requirements including:

• Input requirements

• Output specifications

• Power requirements

• Battery configuration

• Connector requirements

• Cable configuration

• Application environment

Prototype Development

After specification confirmation, prototype samples can be developed for:

• Electrical testing

• Charging testing

• Connector verification

• System verification

Mass Production

After prototype approval, production follows a defined manufacturing process including:

• Component preparation

• Product assembly

• Cable and connector assembly

• Production testing

• Aging testing

• Quality inspection

• Final inspection

• Packaging

Guangdong QINX supports B2B customers from prototype evaluation through repeat production.

Certification Information

Depending on product specifications, target markets, and customer requirements, Guangdong QINX products can be designed to meet applicable certification and compliance requirements, such as UL, cUL, FCC, CE, RoHS, DOE Level VI, UKCA, PSE, SAA and CB.

The applicable certification configuration should be confirmed according to the final product specification and target market.

Frequently Asked Questions

What battery configuration is this charger designed for?

This charger is configured for compatible 5S lithium-ion battery packs, with a 21V full-charge output.

What is the output specification?

The charger provides 21V DC output at up to 3A / 3000mA, with a maximum output power of 63W.

What charging method does the charger use?

The charger uses CC/CV charging, with controlled current and voltage during the charging process.

Which DC connectors are available?

The standard DC connector options are 5.5×2.1mm and 5.5×2.5mm. Customized connector configurations can also be evaluated for OEM projects.

Can the charger be customized?

Yes. Guangdong QINX supports customization of output voltage, current, cable length, DC connector, labeling and packaging for OEM and ODM projects.

Product Summary

The 21V 3A 63W 5S Lithium Battery Charger is a compact AC/DC desktop charging solution designed for compatible 5S lithium-ion battery packs.

It provides 21V DC output at up to 3A / 3000mA and uses CC/CV charging for controlled charging of compatible 5S Li-ion battery systems.

The charger supports a universal 100–240VAC input and offers 5.5×2.1mm or 5.5×2.5mm DC connector options. Its compact 115×50×32mm enclosure and 0.21kg weight make it suitable for various portable and battery-powered equipment.

For customers evaluating CC/CV charging principles, the CC/CV charging guide provides additional technical background.

Guangdong QINX supports OEM and ODM customization for electrical specifications, connectors, cables, labeling and packaging.

Request a Charger Configuration

For OEM or bulk purchasing projects, customers can provide the required battery specifications, 5S configuration, output voltage, charging current, DC connector, cable length and target application.

Guangdong QINX can review the requirements and support prototype evaluation and subsequent mass production according to the confirmed specification.