Product Overview

The INR21700-5500 21700 battery cell is a 5500mAh 21700 lithium-ion rechargeable cell from Jiangsu SunPower, with a nominal voltage of 3.60V and high-current discharge support. Therefore, it is suitable for EV, energy storage, power tools, and battery pack assembly. In addition, we keep large stock and offer wholesale pricing for overseas buyers. Contact us for a quote.

Key Specifications

• Model: INR21700-5500

• Type: 55P

• Nominal Capacity: 5500mAh (0.1C discharge)

• Minimum Capacity: 5500mAh (0.1C), 5400mAh (0.2C)

• Nominal Voltage: 3.60V

• Max. Charge Voltage: 4.20V ± 0.05V

• Standard Discharge Cut-off Voltage: 2.50V

• Standard Charge Current: 2.75A

• Max. Charge Current: 10A

• Max. Continuous Discharge Current: 16.5A without temperature cut; 30A with 75°C temperature cut

• Max. Pulse Discharge Current: 70A (2s pulse)

• Diameter: 21.25 ± 0.15mm (including PET)

• Height: 70.30 ± 0.20mm (including PET)

• Weight: ≤ 75g

• AC Impedance: ≤ 15.0mΩ (at 1000Hz, 30% SOC)

• Operating Temperature: Charge 0°C to 45°C; Discharge -20°C to 60°C

• Storage Temperature: 3 months -20°C to 45°C; 1 year -20°C to 25°C

• Factory Voltage: 3.50V – 3.65V

Performance Highlights

This cell offers stable capacity under different discharge rates. For example, at 20A discharge, relative capacity remains ≥93%. Moreover, low-temperature performance is reliable: ≥70% at -20°C and ≥80% at -10°C. At high temperature, it delivers ≥97% at 60°C. In addition, AC impedance is ≤15.0mΩ, which supports high-current applications. Consequently, pack consistency is strong: voltage difference ≤10mV, impedance difference ≤2mΩ, and capacity difference ≤1%.

Cycle Life

• 500 cycles (2.75A charge / 5.5A discharge): ≥80% capacity

• 300 cycles (5.5A charge / 11A discharge): ≥80% capacity

• 300 cycles (5.5A charge / 16.5A discharge): ≥60% capacity

• 200 cycles (5.5A charge / 20A discharge with 75°C cut): ≥60% capacity

Safety and Reliability

Safety is a key design priority. Therefore, the cell passes overcharge, forced discharge, short circuit, crush, and 130°C heating tests with no fire or explosion. It also passes altitude, drop, vibration, and temperature cycling tests. As a result, it is suitable for demanding battery pack projects.

Applications

Because of its high capacity and discharge current, the INR21700-5500 is widely used in:

• Electric vehicles and e-bikes

• Energy storage systems

• Power tools and garden tools

• Robotics and drones

• Portable power stations

• Industrial battery packs

Packaging and Stock

We pack the cells in standard export cartons. Each carton contains 4 inner boxes, and each inner box holds 80pcs. Moreover, bulk quantities are available from stock. Therefore, we can support fast order fulfillment for overseas buyers.

Why Buy From Us

• Direct supply from Jiangsu SunPower

• Large inventory ready for shipment

• Consistent quality and batch traceability

• Competitive wholesale pricing

• OEM and battery pack support

Contact Us

In summary, we offer favorable prices and substantial stock for the INR21700-5500 21700 battery cell. For wholesale orders or OEM cooperation, please contact us. We will reply promptly with pricing, lead time, and shipping details.