GEB 21700 3.7V 4800mAh 3C High-Rate Cylindrical Lithium-ion Battery Cell (21×70mm)
GEB 21700 3.7V 4800mAh 3C High-Rate Cylindrical Lithium-ion Battery Cell (21×70mm). Confirm the continuous and peak discharge ratings, dimensions, connector and compliance documents against the selected configuration before purchase.
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 4800mAh 3C High-Rate Cylindrical Lithium-ion Battery Cell (21×70mm) is a heavy-duty cylindrical energy storage cell delivering a verified 3.7V nominal working voltage and 4,800mAh rated capacity (17.76Wh energy). Built in an industrial steel canister form factor (Ø 21.2 ± 0.2 mm × H 70.3 ± 0.3 mm) weighing approximately 69g, this cell is engineered for high-drain duty cycles, supporting a true 3C continuous discharge rating (14.4A continuous) and up to 5C peak pulse discharge (24.0A ≤ 5s). Utilizing low-impedance internal winding and an advanced NCM cathode, its AC internal resistance is held under 15 mΩ, ensuring minimal thermal rise and voltage droop during heavy acceleration or continuous motor loading in e-bikes, robotic AGVs, and industrial tools.
Product Overview
The GEB 21700 3.7V 4800mAh 3C High-Rate Cylindrical Lithium-ion Battery Cell represents next-generation cylindrical cell technology, offering a 45% volumetric energy density increase over conventional 18650 cells. Designed for commercial electric scooters, automated guided vehicles (AGV), cordless power equipment, and modular energy storage packs, it features an integrated current interrupt device (CID), mechanical pressure relief vent, and PTC overcurrent protection. With calibrated dimensions of Ø 21.2 ± 0.2 mm × H 70.3 ± 0.3 mm and a unit weight of Approx. 69.0g ± 1.5g, it provides high energy efficiency and sustained cycle life across demanding operational duty profiles.
Product Specifications
| Feature / Attribute | Technical Specification |
|---|---|
| Battery Chemistry | Lithium Nickel Manganese Cobalt Oxide (NCM Cylindrical) |
| Nominal Voltage & Capacity | 3.7V / 4800mAh (17.76Wh) |
| Physical Form Factor & Size | 21700 Cylindrical Steel Can (Ø 21.2 ± 0.2 mm × H 70.3 ± 0.3 mm) |
| Cell Net Weight | Approx. 69.0g ± 1.5g |
| Continuous Discharge Rating | 3.0C continuous (14.4A continuous discharge) |
| Peak Pulse Discharge | 5.0C pulse (24.0A pulse ≤ 5 seconds) |
| Target Applications | Light electric vehicles (LEV), electric bikes, cordless power tools, robotics, industrial battery modules |
| Terminal Form Factor | Flat top (spot-welding optimized) / Optional button top / Pre-attached pure nickel solder tabs |
| Baseline Cycle Life | ≥ 800–1,000 cycles (@ 80% DoD, 25°C, 0.5C charge / 1.0C discharge) |
Technical Specifications
| Parameter | Value | Test Conditions & Engineering Tolerances |
|---|---|---|
| Nominal Operating Voltage | 3.7V | Standard 0.2C discharge test @ 25°C |
| Upper Charge Cutoff Voltage | 4.20V ± 0.02V | CC/CV charge mode, 0.02C termination current |
| Discharge Lower Cutoff | 2.75V ± 0.03V | Controller / BMS automatic low-voltage safety cutoff |
| Standard Charge Current | 0.2C–0.5C (960mA to 2400mA) | Maximum fast charge rate: 1.0C (4800mA) |
| Internal AC Resistance (1kHz) | ≤ 15 mΩ | 1kHz AC impedance test @ 25°C fully charged |
| Cell Consistency Screening | ΔV ≤ 2mV | ΔR ≤ 0.8mΩ | Precision automated sorting for multi-cell series/parallel packs |
| Operating Temperature Range | Charge: 0°C to 45°C | Discharge: -20°C to 60°C | Storage: 15°C to 25°C (40%–50% state of charge) |
Integration & Operational Boundary Conditions
Pack Assembly & Interconnects: For 3C continuous discharge pack designs, pure nickel interconnect strips (≥ 0.20mm thickness) or nickel-copper composite busbars are recommended to minimize resistance losses. Ensure forced-air or conductive thermal cooling is provided in enclosed battery compartments.
Safety Venting Clearances: Always leave at least 1.5mm axial clearance above the positive terminal safety vent cap in pack designs to ensure unobstructed pressure relief under unforeseen abusive conditions.
B2B Supply & Logistics: Supplied in UN-certified packaging with full batch inspection documentation, UN38.3 test certificates, MSDS, and IEC 62133 compliance reports for streamlined global air/ocean export.
Equipment Compatibility & Engineering Fit Check
Before deploying GEB 21700 3.7V 4800mAh 3C High-Rate Cylindrical Lithium-ion Battery Cell (21×70mm), verify these verified electrical and mechanical boundary requirements:
Operational Boundary Conditions
✔ Recommended Fit & Use Cases:
- Electronic devices and OEM packs matched with 3.7V / 4.8Ah 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.
Drone Batteries in Extreme Cold: Winter Flight Degradation, Self-Heating BMS, and Sub-Zero Operation Guide
Engineering guide to UAV batteries in sub-zero cold (-20°C to 0°C). Prevent voltage sag and lithium plating with polyimide PTC self-heating BMS and low-temp electrolytes.
