FYW 18650 2S1P Cylindrical Lithium Battery Pack — 7.4V 3500mAh 25.4Wh

This rechargeable 18650 2S1P lithium-ion battery pack is assembled from two Grade-A 18650 cylindrical cells connected in series, delivering a standard nominal voltage of 7.4V, a rated capacity of 3500mAh and a total energy of 25.4Wh. Built for stable, long-lasting power, it is an ideal power core for portable electronics, backup power systems, portable speakers, medical devices and other 7.4V battery-powered equipment.

Product Overview

Every cell is capacity-sorted and voltage-matched before assembly, then finished with a durable PVC heat-shrink casing and a built-in BMS protection board. This guarantees consistent batch performance, low internal resistance and reliable long-cycle operation — exactly what B2B buyers need for volume production and global export. Full OEM & ODM customization is supported, including wire length, connector type, housing, capacity matching and private-label printing.

Key Specifications

Core Product Advantages

1. True 3500mAh Standard Capacity
   Every cell is capacity-sorted before assembly, so the actual 25.4Wh energy matches the labeled parameter and avoids early endurance decay in finished products.
2. Stable 7.4V Continuous Output
   Low internal resistance and uniform cell consistency keep the voltage steady under continuous discharge, preventing power drops or sudden shutdowns under load.
3. Built-in BMS Multi-Protection
   The integrated protection board guards against overcharge, over-discharge, over-current and short circuit, improving safety and reducing after-sales risk.
4. Export-Ready Compliance
   Compliant with UN38.3, MSDS, CE and RoHS standards, with a full set of shipping documents to support smooth sea and air customs clearance.
5. Full OEM & ODM Customization
   Custom wire length, JST/Molex/DC connectors, housing design, capacity matching and private-label surface printing are all available.

Wide Application Scenarios

• Portable Bluetooth speakers and audio devices
• Portable monitoring & surveillance cameras
• Small portable medical and inspection instruments
• Outdoor backup power and portable power stations
• Smart household and consumer portable electronics
• Other 7.4V battery-powered equipment

Certification & B2B Service

All 18650 2S1P battery packs pass UN38.3 transport testing and RoHS standards, supplied with complete MSDS and export certification files. We support bulk wholesale, OEM and ODM projects with strict quality control for consistent batch stability. Contact us for volume pricing and customized battery solutions.