21700 Battery & Charger

21700 Battery & Charger – Next-Gen High-Energy Li-ion Cells + Professional Chargers, Future-Ready Power in One Stop

Welcome to our 21700 Battery & Charger collection. The 21700 lithium-ion cell (approx. 21mm diameter × 70mm length) is the most significant next-generation cylindrical standard following the 18650. Compared to 18650, the 21700 delivers 50%–100% more capacity with only a ~47% increase in volume, with mainstream capacities from 3000mAh to 5800mAh and high-drain models supporting 30A–45A continuous discharge. This collection offers a full range of 21700 cells—High-Capacity, High-Drain, Protected, and LiFePO₄—along with dedicated Li-ion chargers compatible with 21700/20700/18650/26650 and more. Ideal for electric vehicles, premium power tools, high-power vaping, tactical flashlights, portable power stations, and industrial energy storage.

Core Advantages of 21700 Batteries

• Substantial Capacity Leap: Mainstream capacities of 4000mAh–5000mAh, with flagship models reaching 5800mAh—a single cell delivers extended runtime for high-drain devices.
• Impressive Power Output: High-drain 21700 cells support 30A–45A continuous discharge with internal resistance as low as 8mΩ–15mΩ—ideal for power tools and vaping.
• Lower Internal Resistance, Less Heat: Larger electrode area and optimized structure reduce IR, minimizing temperature rise under heavy load for longer cycle life.
• Higher Pack Efficiency: Fewer cells are needed to achieve a given capacity, reducing welding, BMS, and structural costs while improving reliability.
• Diverse Chemistries: Available in high-capacity NMC, high-drain INR, protected, and inherently safe LiFePO₄ formulations.

Core Advantages of 21700 Dedicated Chargers

• Precision Charging Management: CC/CV profile with automatic battery type detection (Li-ion/LiFePO₄) and auto-termination to prevent overcharging.
• Multiple Safety Protections: Built-in overcharge, over-discharge, overcurrent, short-circuit, reverse polarity, and overheat protection.
• Wide Size Compatibility: Supports 21700, 20700, 18650, 26650, 18500, and more—one charger for multiple formats.
• Independent Charging Channels: Multi-bay chargers control each slot independently—mix cells of different charge levels and sizes.
• LCD Digital Display: Real-time monitoring of voltage, current, charged capacity, and internal resistance.
• Fast Charging Support: Select models support 2A–3A fast charging for significantly reduced wait times.

21700 vs. 18650 vs. 20700 – Key Comparison

Popular 21700 Battery & Charger Models – Quick Reference

Typical Specifications Range (21700 Battery & Charger)

Typical Applications

How to Choose the Right 21700 Battery & Charger?

⚠️ 21700 Battery & Charger Safety Guidelines

• Voltage Platform Awareness: 3.2V LiFePO₄ and 3.7V NMC cells cannot be mixed or charged with the same settings. Ensure the charger is set to the correct mode.
• Dimensional Compatibility: 21700 cells are larger in diameter and length than 18650. Verify your device supports 21mm diameter × 70mm length.
• Use a Quality Charger: Always use a reliable charger designed for Li-ion or LiFePO₄ chemistry.
• Avoid Over-Discharge: Stop discharging when voltage drops below 2.5V–2.8V (NMC) or 2.0V–2.5V (LiFePO₄). Recharge promptly.
• Avoid Short Circuits and High Temperatures: Do not short the terminals. Keep away from fire, heat, and moisture.
• Discontinue if Damaged: Stop using cells with torn wraps, dents, or leakage. Recycle responsibly.

Why Choose Our 21700 Battery & Charger Collection?

• Genuine Grade-A Cells: Batteries from Samsung, LG, Molicel, Panasonic, EVE, and other Tier-1 manufacturers. Chargers from XTAR, Nitecore, and professional brands.
• Fully Tested & Matched: Every battery batch undergoes capacity grading, IR testing, and voltage sorting. Industrial-grade matching available.
• One-Stop Shopping: Cells, chargers, and accessories all in one place.
• Flexible Purchasing: Single-cell retail, multi-pack discounts, tiered bulk pricing, and custom pack assembly.
• Certified & Documented: UN38.3, MSDS, CE, RoHS documentation provided.
• Expert Technical Support: Guidance on cell selection, charger matching, and after-sales service.

👇👇👇 Browse the product list below to find the perfect 21700 Battery & Charger combo for your application. For volume quotes or custom pack solutions, please contact our engineering team.