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Ampace INR21700-A

Ampace INR21700-A

Technical Specifications

Nominal Voltage: 3.7 V 
Typical Capacity: ~4,000 mAh (4.0 Ah) 
Dimensions: Diameter ~21.2 mm, Height ~70.3 mm 
Weight: ~68-70 g

Charge Cut-off Voltage: ~4.2 V
Discharge Cut-off Voltage: ~2.5 V
Max Continuous Discharge Current: ~45 A
Peak Discharge Current (approx): up to ~60-70 A in high-rate use cases
Operating Temperature Range: Discharge –20 °C to 75 °C; Charge 0 °C to 60 °C

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Key Performance Highlights

  1. High Capacity: ~4,000 mAh class, optimized for long-duration energy output.
  2. Strong Discharge Capability: Supports 10–15 A continuous discharge depending on thermal conditions.
  3. Balanced Power & Energy: Designed to offer both high energy density and stable mid-drain performance.
  4. Extended Cycle Life: Durable chemistry suited for frequent charge/discharge applications.
  5. Low Internal Resistance: Ensures efficient output and reduced heat generation during operation.
  6. Reliable Safety Architecture: Built with robust protection design and strict Ampace quality control.
  7. Wide Application Range: Ideal for e-bikes, portable power stations, ESS modules, tools, and industrial battery packs.
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Factory Direct Supply-Guarantee 100% Genuine Cells And Better Price Ampace INR21700-A battery cell specification

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INR21700-A certificatesMSDS, UN38.3, UL, CB, IEC62133, BIS, etc.

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Frequently Asked Questions

What is the maximum continuous discharge current?

Typical continuous discharge is 10–15 A, depending on thermal management and pack design.

Does this cell have built-in protection?

No. Like most cylindrical cells, it is unprotected and must be paired with a proper BMS/PCM in battery packs.

Can the INR21700-A be used in series or parallel configurations?

Yes. It supports both configurations when cells are properly matched and a suitable BMS is used.

What is the recommended charging method?

Standard CC/CV charging:

  • Charge voltage: 4.20V
  • Standard charge current: around 0.5C (≈2.5 A recommended)

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