GEB 21700 3.7V 4800mAh Cylindrical Lithium-ion Battery Cell (21×70mm)
Grade-A GEB 21700 3.7V 4800mAh cylindrical Li-ion battery cell with Ø 21.2 ± 0.2 mm × H 70.5 ± 0.3 mm dimensions, low IR, and 2C discharge for electric mobility, robotics, and power packs.
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 Cylindrical Lithium-ion Battery Cell (21×70mm) is a high-capacity Grade-A cylindrical Lithium-ion power cell delivering a verified 3.7V nominal operating voltage and 4,800mAh rated capacity (17.76Wh energy content). Formulated with high-energy NCM chemistry in a standard 21700 steel casing with integrated CID/PTC safety mechanisms, this cell provides tight electrochemical tolerances (ΔV ≤ 3mV, ΔR ≤ 1.5mΩ) and continuous 1.0C–2.0C discharge capability (4.8A–9.6A continuous) with 3.0C pulse capability (14.4A ≤ 5s). Ideal for high-density modular pack assembly in commercial electric mobility, industrial AGVs, portable power stations, and outdoor energy storage, engineers should ensure proper cell holder spacing and busbar thermal management during integration.
Product Overview
The GEB 21700 3.7V 4800mAh Cylindrical Lithium-ion Battery Cell (21×70mm) is an industrial-grade cylindrical cell manufactured to strict electrochemical tolerances for high-reliability applications. Featuring a 3.7V nominal voltage and 4800mAh rated capacity, this cell incorporates a pressure-relief safety vent (CID/PTC for Li-ion), precision steel can packaging, and ultra-low internal resistance (≤ 25 mΩ). With physical dimensions of Ø 21.2 ± 0.2 mm × H 70.5 ± 0.3 mm and a calibrated unit weight of Approx. 69.0g ± 1.5g, it is engineered for electric bicycles, high-power flashlights, electric scooters, medical equipment, and custom battery pack modules. Before integrating GEB 21700 3.7V 4800mAh Cylindrical Lithium-ion Battery Cell (21×70mm), verify rated voltage, current limits, enclosure clearance, connector polarity and charger profile against the target equipment.
Product Specifications
| Feature / Attribute | Technical Specification |
|---|---|
| Battery Chemistry | Lithium Nickel Manganese Cobalt (NCM 21700) |
| Nominal Voltage & Capacity | 3.7V / 4800mAh (17.76Wh) |
| Physical Dimensions & Weight | Ø 21.2 ± 0.2 mm × H 70.5 ± 0.3 mm / Approx. 69.0g ± 1.5g |
| Continuous Discharge Rating | 1.0C–2.0C (4.8A–9.6A continuous discharge) |
| Peak Pulse Discharge | 3.0C (14.4A pulse ≤ 5s) |
| Target Applications | Electric bicycles, light electric vehicles, portable power stations, industrial AGVs, power tools |
| Terminal Form Factor | Flat Top / Button Top / Pre-welded Solder Tabs |
| Service Life / Endurance | ≥ 500–1,000 cycles (@ 80% DoD, 25°C, 0.5C/0.5C) |
Technical Specifications
| Parameter | Value | Test Conditions & Engineering Tolerances |
|---|---|---|
| Nominal Operating Voltage | 3.7V | Standard measurement @ 25°C, 0.2C rate |
| Upper Voltage / Cutoff | 4.20V ± 0.02V (CC/CV mode) | Regulation tolerance ±0.02V–0.03V |
| Discharge Lower Cutoff | 2.75V – 3.00V ± 0.03V | Safety lower voltage cutoff threshold |
| Internal AC Resistance (1kHz) | ≤ 25 mΩ | 1kHz AC test @ 25°C fully charged state |
| Cell Consistency Screening | ΔV ≤ 3mV | ΔR ≤ 1.5mΩ | Pre-assembly automated barcode classification SOP |
| Operating Temperature Range | Charge: 0°C to +45°C | Discharge: -20°C to +60°C | Ambient environmental test qualification |
Equipment Compatibility & Engineering Fit Check
Before deploying GEB 21700 3.7V 4800mAh 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.
Cylindrical Battery Sourcing: Capacity and QC Verification Guide
How hardware engineers evaluate true C-rate capability, temperature rise curves, and Grade-A barcode traceability.
