Custom 18650 / 21700 Lithium Battery Pack for OEM Devices

MYLION designs and manufactures custom cylindrical lithium battery packs for B2B OEM devices. We support 18650, 21700 and LiFePO4 battery pack development with BMS protection, connector, wire, housing, charger matching, certification application and mass production support.

Upload Device Drawing

Submit Project Requirement

What Can Be Customized

A custom battery pack is not only about voltage and capacity. MYLION evaluates cell type, BMS, connector, wire, housing, charger, certification and mass production feasibility according to your device requirement.

Cell Type

Evaluate 18650, 21700, or LiFePO4 cells by density, current, size, and availability.

Voltage & Capacity

Configure series and parallel cells for required voltage, capacity, current, and runtime.

BMS Protection

Match BMS protection for overcharge, over-discharge, over-current, short-circuit.

Connector & Wire

Customize connectors, cable length, wire direction, and terminals for device.

Housing & Structure

Select shrink wrap, brackets, holders, or cases based on specific project requirements.

Charger Matching

Match charging voltage, and charger options with battery and BMS requirements.

Label & Packaging

Support OEM labels, warnings, cartons, and packaging design for custom B2B projects.

Certification Documents

Support certification applications and shipping documents for target markets.

Battery Pack Structure Options

PVC Shrink-Wrapped Pack

Cost-effective and flexible structure for compact OEM devices.

Plastic Case Battery Pack

Better appearance, protection and installation convenience for finished device integration.

Aluminum Housing Battery Pack

Stronger mechanical protection and better structural stability for industrial and outdoor applications.

Custom Mechanical Design

Battery housing, bracket, foam, cable outlet and mounting method can be designed according to your project.

Typical 18650 Battery Pack Configurations

1S 3.6V / 3.7V

Portable electronics, small devices

2S 7.2V / 7.4V

Medical equipment, instruments, handheld terminals

3S 10.8V / 11.1V

Industrial electronics, backup modules

4S 14.4V / 14.8V

Portable power systems, OEM devices

5S 18V / 18.5V

Selected industrial equipment

6S 21.6V / 22.2V

Higher-voltage device projects

High-Value OEM Applications

Medical & Healthcare Devices

Portable diagnostic, monitoring and healthcare-related devices.

Test & Measurement Instruments

Handheld meters, inspection tools and professional measuring systems.

Industrial Electronics

Control terminals, automation devices and compact industrial modules.

Communication and Backup Power

Router, gateway, modem, IoT terminal and backup power applications.

Security & Access Control Devices

Alarm systems, access control terminals and security equipment.

Portable OEM Devices

Custom battery packs for brand owners and device manufacturers

Quality & Certification Control

Quality Control and Mass Production Support

From sample development to mass production, MYLION supports B2B custom battery pack projects with engineering review, sample testing, production follow-up, 100% inspection before shipment and batch traceability according to project requirements.

Engineering Review Before Production

Review voltage, current, runtime, size, BMS, connector, charger and certification requirements before sample or production.

Sample Testing Support

Samples can be checked through electrical test, BMS function test, charging/discharging test and appearance inspection.

100% Inspection Before Shipment

Every MYLION battery pack is 100% inspected before shipment according to project requirements, quality standards, and specifications.

Traceability Control

Cell batch, BMS, production record, inspection result and shipment batch can be managed according to project needs.

Production Follow-Up

Production status, quality inspection and packing can be followed for B2B project delivery.

Long-Term Repeat Order Support

MYLION supports product updates, repeat orders, documentation and long-term supply cooperation.

Engineering Review Before Quotation

Before quotation, MYLION reviews your device voltage, working current, peak current, size limit, connector type, charging method, enclosure requirement and certification target. This helps us recommend a safer and more suitable battery pack solution for your project.

Send Your Device Specs

Voltage / Capacity Current Review

Cell, BMS and Structure Recommendation

Sample Quotation and Drawing Confirmation

Sample Testing and Bulk Production

FAQ

Q: What information should I provide for a custom battery pack project?

A: Please provide device application, working voltage, continuous current, peak current, target runtime, battery size limit, connector requirement, charging method, certification requirement, estimated quantity and destination country. Device photos or drawings are helpful.

Q: Should I choose 18650 or 21700 cells?

A: 18650 cells are suitable for mature designs, compact structures and cost-effective projects. 21700 cells may be better for higher capacity, longer runtime and fewer-cell pack designs. Final selection depends on size, current, energy and supply requirement.

Q: Can MYLION customize the BMS?

A: MYLION can support BMS matching according to voltage, current, protection requirement, charging method and application condition. Smart BMS or communication functions can be evaluated according to project requirement.

Q: Can you customize connector, wire and housing?

A: Yes. Connector, wire length, cable direction, label, packing and selected housing customization can be supported according to project quantity and technical requirement.

Q: Can MYLION help apply for battery certifications?

A: Yes. MYLION can help customers apply for UL, IEC62133, CB, CE, RoHS, FCC, UKCA, UN38.3 and related documents according to project requirements.

Q: Do you support medical device battery packs?

A: MYLION can develop battery packs for selected medical and healthcare devices according to safety, documentation and compliance requirements. Final suitability should be evaluated based on the device and required standard.

Q: What is the MOQ for custom battery packs?

A: MOQ depends on cell type, BMS, connector, housing, tooling, certification and production requirement. Standard or simple pack samples may be easier to arrange than fully customized projects.

Q: Do you provide samples before mass production?

A: Sample arrangement can be evaluated after technical requirements are confirmed. Customer testing in the real device is recommended before mass production.

Need a Custom 18650 Battery Pack for Your Device Project?

Send us your voltage, capacity, working current, peak current, size limit, connector type, enclosure requirement and target application.

Request Custom Quote