21700 Batteries

21700 Batteries – The Next-Gen Cylindrical Standard: Higher Capacity, Greater Power, Longer Life

Welcome to our 21700 Batteries collection. The 21700 lithium-ion cell (21mm diameter × 70mm length) is widely recognized as the most significant cylindrical battery upgrade following the 18650. Compared to 18650, the 21700 delivers nearly 50% more energy density with only a ~47% increase in volume, offering capacities from 3000mAh up to 5800mAh, lower internal resistance, and superior thermal management. This format has seen rapid adoption in Tesla EVs, premium power tools, high-power vaping devices, portable power stations, and industrial equipment.

This collection is organized into three core categories based on chemistry and safety configuration. Whether you need maximum energy density, ultimate safety, or protected plug-and-play cells, you'll find precisely what you need here.

Core Advantages of 21700 Batteries

• Leap in Energy Density: Typical capacities range from 4000mAh to 5000mAh, with flagship models reaching 5800mAh—delivering extended runtime from a single cell.
• Impressive Power Delivery: High-drain 21700 cells support 30A–45A continuous discharge with internal resistance as low as 8mΩ–15mΩ, ideal for power tools, vaping, and light EVs.
• Superior Thermal Management: Larger surface area and internal volume improve heat dissipation, reducing temperature rise under heavy loads and enhancing system-level safety.
• Extended Cycle Life: Under equivalent operating conditions, 21700 cells generally outlast 18650s, offering a lower total cost of ownership.
• Growing Standardization: As an emerging mainstream format, 21700 enjoys broad support from charger, flashlight, battery holder, and device manufacturers.

21700 Battery Category Guide

Popular 21700 Cell Models – Quick Reference

Typical Specifications Range (21700)

Typical Applications

How to Choose the Right 21700 Battery?

⚠️ 21700 Battery Safety Guidelines

• Voltage Platform Awareness: 3.2V LiFePO₄ and 3.7V NMC cells cannot be mixed or charged with the same charger. Always verify device and charger compatibility.
• Dimensional Compatibility: Protected 21700 cells are 3–5mm longer. Measure your device's battery compartment before purchase.
• Use a Quality Charger: Always use a reliable charger designed for Li-ion or LiFePO₄ chemistry.
• Avoid Short Circuits & Overheating: Do not short the terminals. Keep away from heat, moisture, and metal objects.
• Discontinue if Damaged: Stop using cells with torn wraps, dents, or leakage. Recycle responsibly.

Why Choose Our 21700 Batteries?

• Genuine Grade-A Cells: Direct sourcing from Samsung, LG, Murata, Molicel, Panasonic, EVE, BAK, and other Tier-1 manufacturers. No recycled or counterfeit cells.
• Fully Tested & Matched: Every batch undergoes capacity grading, IR testing, and voltage sorting. Industrial-grade matching available.
• Complete Portfolio: Covers NMC high-capacity/high-drain, protected, and LiFePO₄ series—one-stop for all 21700 needs.
• Bulk & Custom Solutions: Single-cell retail, multi-pack discounts, tiered bulk pricing, and custom series/parallel pack assembly.
• Certified & Documented: UN38.3, MSDS, CE, RoHS documentation provided for seamless international shipping.
• Expert Technical Support: Guidance on cell selection, pack design, BMS integration, and after-sales service.

👇👇👇 Explore our NMC 21700, Protected 21700, and IFR21700 / LiFePO₄ | 3.2V collections using the subcategory navigation below. For volume quotes or custom pack solutions, please contact our engineering team.