402040 300mAh 3.7V Reliable Li‑Polymer Rechargeable Battery Cell

This KC‑certified li polymer battery delivers steady 3.7V power for compact small electronics. As a practical lithium ion battery cell, it fits wearable and portable gadgets, preventing sudden power loss during daily use. Custom options and sample testing are supported for your project needs.

• Stable Power Output for Compact Gadgets: Built as a 3.7V wearable device battery, it maintains consistent discharge performance under standard load, ensuring your portable devices run smoothly without unexpected shutdown.
• Reliable Long Cycle Performance: Up to 500 working cycles for repeated charge and discharge, providing extended service life and lower long‑term replacement cost for your finished products.
• Flexible Custom Connector & Parameters: Select JST or Molex connector to match your hardware. Custom size, capacity and voltage are acceptable with no extra modification work needed on your end‑product.
• Strict KC Safety Certification: This lithium ion battery cell passes KC certification, meeting basic safety requirements for importing electronic goods into Korea and many other regions.
• Factory Direct Supply & Sample Support: As original manufacturers, we provide sample testing before bulk orders, allowing you to verify real performance before placing mass production orders.
• Practical Lead Time Arrangement: Stock items ship within 3‑7 days; custom production finishes in 2‑3 weeks, helping you arrange inventory and project schedules efficiently.

This versatile 3.7V wearable device battery fits a wide range of portable consumer electronics for home, commute, travel and outdoor camping scenarios.

• Sample verification is encouraged to confirm fit for your devices before mass procurement
• All goods are packed with industrial cartons complying with international air and sea transport rules
• Our support team offers fast reply for product parameter and application consultation
• For quality‑related defects from production, valid after‑sales solution will be arranged under proper usage condition
• Custom projects get dedicated follow‑up during the whole production cycle