GEB 21700 3.7V 4000mAh 5C High-Rate Cylindrical Li-ion Battery Cell (20A Continuous)
Grade-A GEB 21700 3.7V 4000mAh 5C High-Rate Cylindrical Li-ion Battery Cell (20A Continuous) (3.7V, 4000mAh) cylindrical battery with Ø 21.2 ± 0.2 mm × H 70.5 ± 0.3 mm dimensions, low IR, and UN38.3 documentation for Electric bicycles, power tools, electric scooters, medical equipment, custom battery pack modules.
B2B Engineering Review & Pricing
Direct manufacturer supply, custom BMS telemetry, and CAD fit validation for OEM/ODM projects.
Product Details
The GEB 21700 3.7V 4000mAh 5C High-Rate Cylindrical Li-ion Battery Cell (20A Continuous) is a high-performance Grade-A cylindrical power cell delivering 3.7V nominal voltage, 4,000mAh rated capacity (14.8Wh energy content), and a certified continuous discharge rating of 5C (20A continuous load). Built with high-strength nickel-plated steel casing, integrated CID/PTC safety vents, and low AC internal impedance (≤ 15–20 mΩ), this 21700 cell provides superior energy density combined with robust thermal dissipation under heavy discharge. Designed for electric scooters, e-bikes, robotics, and high-drain power equipment, engineers must calibrate BMS overcurrent protection, verify pure nickel interconnect tab thickness, and employ cell spacing holders for optimal heat management.
Product Overview
The GEB 21700 3.7V 4000mAh 5C High-Rate Cylindrical Li-ion Battery Cell (20A Continuous) represents the next-generation cylindrical format, providing significantly greater volumetric energy density than traditional 18650 cells while handling high continuous current. Delivering 3.7V nominal voltage and 4000mAh rated capacity, it sustains a verified 20A continuous output. With precision physical dimensions of Ø 21.2 ± 0.2 mm × H 70.5 ± 0.3 mm and calibrated unit weight of Approx. 68.5g ± 1.5g, it is engineered for light electric vehicles, commercial AGVs, motorized wheelchairs, portable power banks, and high-capacity cordless power tools.
Product Specifications
| Feature / Attribute | Technical Specification |
|---|---|
| Battery Chemistry | Lithium Nickel Manganese Cobalt Oxide (NCM 21700 Cylindrical) |
| Nominal Voltage & Capacity | 3.7V / 4000mAh (14.8Wh) |
| Physical Dimensions & Weight | Ø 21.2 ± 0.2 mm × H 70.5 ± 0.3 mm / Approx. 68.5g ± 1.5g |
| Continuous Discharge Rating | 5C (20A) sustained continuous discharge |
| Peak Pulse Discharge | 8C–10C (32A–40A pulse ≤ 5s) |
| Target Applications | Electric bicycles, electric scooters, AGVs, robotics, high-drain battery pack modules |
| Terminal Form Factor | Flat Top / Optional Button Top / Custom Pre-welded Solder Tabs |
| Service Life / Endurance | ≥ 500–1,000 cycles (@ 80% DoD, 25°C, 0.5C/1C) |
Technical Specifications
| Parameter | Value | Test Conditions & Engineering Tolerances |
|---|---|---|
| Nominal Operating Voltage | 3.7V | Standard discharge @ 25°C, 0.2C rate |
| Upper Voltage / Cutoff | 4.20V ± 0.02V (CC/CV mode) | Standard Li-ion charge regulation threshold |
| Discharge Lower Cutoff | 2.75V – 3.00V ± 0.03V | Safety lower voltage threshold |
| Internal AC Resistance (1kHz) | ≤ 15–20 mΩ | 1kHz AC test @ 25°C fully charged state |
| Cell Consistency Screening | ΔV ≤ 3mV | ΔR ≤ 1.5mΩ | Pre-assembly automated barcode classification SOP |
| Standard / Fast Charge Current | 0.5C (2000mA) / 1.0C (4000mA) | CC/CV charge to 4.20V, 0.02C cutoff |
| Operating Temperature Range | Charge: 0~45°C | Discharge: -20~60°C | Ambient environmental test qualification |
Equipment Compatibility & Engineering Fit Check
Before deploying GEB 21700 3.7V 4000mAh 5C High-Rate Cylindrical Li-ion Battery Cell (20A Continuous), verify these verified electrical and mechanical boundary requirements:
Operational Boundary Conditions
✔ Recommended Fit & Use Cases:
- Electronic devices and OEM packs matched with 3.7V / 4Ah power curves.
- Commercial designs requiring high volumetric energy density and predictable discharge curves.
- Projects requiring batch consistency with automated barcode impedance sorting.
⚠ Operational Constraints & Limits:
- Do not discharge below minimum cutoff voltage or charge beyond 4.2V.
- Maintain operational surface temperature within -20°C to +60°C discharge (0°C to +45°C charge).
- Ensure connector polarity and pin assignment match system schematics prior to initial power-up.
First-Party Manufacturing SOP & Export Compliance
Technical Whitepapers & Engineering Guides
High-Performance Cylindrical Batteries: 16 Years of B2B Manufacturing
Technical breakdown of automated cell sorting, delta IR matching, laser welding busbars, and cycle aging protocols.
Industrial Cylindrical Batteries: QC, Aging and Test Standards
Key factory inspection criteria for cylindrical packs, thermal management, vibration testing, and BMS protection thresholds.
LiPo Innovations: Reshaping High-Drain Power Applications
Explore high-drain LiPo pouch innovations: multi-tab z-fold stacking, AC IR ≤ 1.0mΩ, 45C continuous discharge, and voltage sag prevention for robotics & eVTOL.
