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INR21700 5000mAh 70A Ultra High Power Full Tab / Tabless Lithium-ion Battery Cell
The INR21700 5000mAh is a next-generation high power cylindrical lithium-ion cell designed to meet the extreme energy demands of modern industrial and commercial equipment. Engineered with state-of-the-art full tab (tabless) internal architecture, this cell boasts an ultra-low AC internal resistance (ACIR ≤ 4.0mΩ).
Technical Specifications
Specification Parameter
Technical Value / Detail
Cell Model
RS50 INR21700 Series (5000mAh)
Nominal Voltage
3.6V
Nominal Capacity
Typical ~5000mAh (Min. 4950mAh @ 0.2C)
AC Internal Impedance (ACIR)
≤ 4.0 mΩ (@ 1kHz, typical ~3.0mΩ)
Charge Cut-off Voltage
4.20V
Discharge Cut-off Voltage
2.50V
Standard Charging Current
2.5A (0.5C)
Max. Fast Charge Current
15A (3C Fast Charge)
Max. Continuous Discharge
70A (with 80°C surface thermal cut-off)
Cell Dimensions
Max. Diameter: 21.35mm / Max. Length: 70.30mm
Cell Weight
≤ 67.0g
Operating Temperature
Charge: -20°C to 60°C / Discharge: -40°C to 80°C
Storage / Shipping SOC
3.46V ~ 3.52V (~30% SOC)
Key Performance Highlights
Advanced Tabless / Full Tab Structure: Features cutting-edge full-tab construction that drops internal resistance to ≤ 4.0mΩ, vastly lowering operating temperatures under high-current loads.
Extreme High-Drain Capacity: Effortlessly sustains continuous 40A currents with surface temperatures kept under 70°C, while capable of handling burst pulse discharges up to 90A.
Unrivaled Low-Temperature Performance: At -20°C under 40A load, initial output voltage stays above 2.2V; at -40°C extreme cold, delivers steady 10A current with initial voltage exceeding 2.3V.
Long Cycle Life Expectancy: Heavy-duty use retains ≥80% capacity at 500 cycles; deep cycle use delivers over 1000 cycles; standard use achieves 1500+ full charge/discharge cycles.
Certified Safety Standards: Verified compliant with UN38.3, UL1642 crush tests (13kN), drop tests, high-voltage overcharge, 130°C thermal exposure, and short-circuit protection.
Light Electric Vehicles (LEVs): High-performance e-motorcycles, premium electric bikes, urban e-scooters, and golf carts
Portable Energy Storage Systems (ESS): High-wattage outdoor generator stations, solar power packs, and emergency UPS backups
Safety Instructions & Handling Guidelines
Dedicated Lithium Charger Only: Always charge using a reliable, dedicated Li-ion charger set to 4.2V cut-off limit.
Voltage Range Protection: Do not overcharge past 4.2V or over-discharge below 1.5V.
BMS Requirement: Cells must be assembled with a qualified Battery Management System featuring thermal, over-current, and short-circuit protection.
Thermal Precaution During Welding: Avoid prolonged heat contact; direct soldering on terminals is prohibited.
Short-Circuit Prevention: Never carry bare cells near metal objects; always transport with insulating terminal caps.
Storage Protocol: For long-term storage, maintain partial state of charge (3.45V to 3.95V) in cool, moisture-controlled environment.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company
Year Established:
2018.04.10
Employee Number:
147~178
Ecer Certification：
Verified Supplier
Shenzhen EMB Technology Co., Ltd.
is an integrated lithium battery solutions provider specializing in battery cell supply, battery pack manufacturing, and energy storage solutions for global customers.
Headquartered in Shenzhen, China’s innovation and technology hub, EMB combines strong supply c...
Shenzhen EMB Technology Co., Ltd.
is an integrated lithium battery solutions provider specializing in battery cell supply, battery pack manufacturing, and energy storage solutions for global customers.
Headquartered in Shenzhen, China’s innovation and technology hub, EMB combines strong supply c...
