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21700 Battery 5000mAh Lithium ion High Capacity Rechargeable Cell
Power your devices longer with the advanced 21700 Battery 5000mAh Lithium ion. This high capacity cell delivers exceptional energy density in a compact 21mm x 70mm format. Ideal for high-drain portable electronics, it offers reliable 15A continuous discharge and 500+ deep cycles.
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Product Advantages:
Our 21700 Battery 5000mAh leverages next-generation NMC chemistry to achieve a remarkable 18Wh per cell, significantly outperforming traditional 18650 batteries. The larger format reduces the number of cells needed in a pack, simplifying assembly while increasing total capacity. With a consistent low internal resistance (<18mΩ), it delivers stable power even under sustained loads.
1. Massive Energy Density · Up to 5000mAh+
Utilizing advanced High-Nickel NMC 811 chemistry, our 21700 battery cells achieve an energy density exceeding 260Wh/kg. With a single-cell capacity of up to 5000mAh, they offer over 35% more energy than traditional 18650 cells, enabling longer runtime without increasing device size.
2. Extreme Power Output · 40A Continuous Discharge
Engineered for high-demand applications, our high-rate 21700 cells support 40A continuous discharge and 70A pulse discharge. Featuring multi-layer coating technology and a tabless design, the internal resistance is as low as <8mΩ, delivering instant power for power tools and high-performance drones.
3. Ultra-Long Cycle Life · 2000+ Deep Cycles
Our Lithium Iron Phosphate (LiFePO4) 21700 batteries offer a cycle life exceeding 2000 charges (with 80% capacity retention), which is 4 times longer than standard ternary lithium cells. This ensures stable performance for over 5 years of daily use, significantly reducing long-term replacement costs.
4. Military-Grade Safety · 9-Layer Protection System
Comprehensive safety from material to structure:
Ceramic-coated separator (heat resistance >200°C)
Bi-directional CID (Current Interrupt Device) for pressure cut-off
PTC (Positive Temperature Coefficient) element
Explosion-proof scored vent
Ternary 21700 cells pass nail penetration, overcharge, and short-circuit tests. LiFePO4 21700 cells offer intrinsic safety with zero risk of fire or explosion.
5. Extreme Temperature Adaptability · -40°F to 176°F Operation
Specialized electrolyte formulations combined with tabless technology allow our low-temperature 21700 batteries to deliver over 60% capacity at -40°C. Our high-temperature variants operate stably at 80°C, meeting the rigorous demands of polar expeditions, desert operations, and military equipment.
6. Ultra-Low Self-Discharge · Ready When You Are
Utilizing high-purity electrolytes and advanced separator technology, our 21700 lithium-ion cells feature an annual self-discharge rate of less than 3%. Even after one year of storage, they retain over 90% of their charge, making them ideal for emergency backup power and fire safety equipment.
7. Perfect Compatibility · Standard 21x70mm Size
Strictly manufactured to IEC 21700 international standards (Diameter 21±0.1mm, Height 70.0±0.2mm), these cells are compatible with all standard 21700 battery holders, nickel strips, spot welders, and chargers. Available in flat-top or button-top versions for easy series or parallel configuration.
8. Green Certified · Eco-Friendly Lifecycle
All our 21700 cells are RoHS and REACH compliant, free from mercury, lead, and cadmium. Our manufacturing facilities are ISO14001 certified, and we have established a battery recycling channel to help your brand build a sustainable, eco-conscious image.
21700 Battery Application Direction:
This high capacity lithium ion 21700 cell is the top choice for high-end power banks, electric bicycle batteries, portable power stations, and even EV conversions. Its flat-top design facilitates spot welding for custom battery packs, while the robust construction withstands vibration in mobile applications.
💡 Application Guide:
High Capacity: Laptops, Power Banks, Camping Lights
High Rate: Drills, Saws, Drones, RC Hobby
LiFePO4: Solar Storage, RVs, 5G Base Stations
Low Temp: Polar Gear, Cold Chain Logistics, Aerospace
21700 Battery Safety performance:
Equipped with multiple safety layers, each 21700 battery features a CID (Current Interrupt Device) and a pressure relief vent. The separator is coated with ceramic to prevent thermal runaway at elevated temperatures. All cells pass strict UL and RoHS certifications, ensuring safe operation in consumer devices.