BAK 21700 45D

BAK 21700 45D

$5.24

21700 Li-ion cell, 5300mAh nominal capacity and 10A continuous discharge.

260 in stock

SKU: BAK-21700-45D Category:

21700 high-power Li-ion cell, 4400mAh nominal capacity and up to 60A continuous discharge (industrial applications).

Technical Specifications

Model BAK INR2170-45D 4400mAh High-Power Battery
Format 21700 cylindrical
Nominal Capacity 4500mAh (typical 4.4Ah)
Nominal Voltage 3.6V
Continuous Discharge up to 60A (high-power cell)
Brand BAK
Chemistry NMC Li-ion

Safety Warning

Unprotected industrial cell. Always use with a properly designed BMS and matching load. Never short-circuit or overcharge. Keep away from fire and extreme heat. Not for use in e-cigarettes or similar consumer devices.

Cell Specification

Item Specification and comments
Model INR2170-45D – high-power cylindrical lithium-ion rechargeable cell
Nominal capacity 4500mAh (4.4Ah) – capacity at 0.2C discharge down to around 2.5V at 25°C
Minimum capacity ≈4400mAh (typical minimum for 4.4Ah class high-power cells)
Nominal voltage 3.6V
Standard charge CCCV ~0.5C (≈2.2A) to 4.20V, with cut-off at low current
Maximum charge current up to 1C (≈4.4A) with appropriate thermal management
Standard discharge current 0.2C (≈0.88A) for capacity rating
Maximum continuous discharge up to 60A continuous (high-power use; pack must stay within datasheet limits)
Discharge cut-off voltage ≈2.5V (recommended end-of-discharge under normal use)
Approx. dimensions Diameter ≈21.3mm, height ≈70.5mm (21700 format high-power cell)
Approx. weight ≈69g (typical mass for BAK 45D)
Operating temperature (charge) 0~55°C (cell surface)
Operating temperature (discharge) -20~80°C (cell surface, depending on application and cooling)
Storage temperature -20~25°C for long-term storage; higher temperatures acceptable for shorter periods if SoC is reduced

Download Manufacturer data sheet

Battery Safety

Battery Safety & Product Disclaimer

Read before purchasing or using any rechargeable lithium-ion battery.

Rechargeable lithium-ion batteries are high-energy devices that require proper handling and technical knowledge. Improper use can lead to fire, explosion, thermal runaway, serious injury, property damage, or death.

By purchasing products from CH-AmpX, you acknowledge these risks and agree to use all battery products responsibly and in accordance with manufacturer specifications.

Read the Complete Battery Safety Guide

Is This Product Right for You?

CH-AmpX battery cells are intended for:

  • Professional battery pack builders
  • Engineers and product developers
  • Industrial applications
  • Qualified hobbyists familiar with lithium-ion battery technology

These cells are designed to be integrated into battery packs protected by an appropriate Battery Management System (BMS) or Protection Circuit Board (PCB).

They are not intended for standalone consumer use, vaping devices, e-cigarettes, or any application lacking proper battery protection.

Before Every Use

Always inspect every battery before charging, installing, or transporting it.

Do not use any battery that shows signs of:

  • Damaged or torn PVC wrapping
  • Missing insulator ring
  • Dents or crushed casing
  • Swelling or bulging
  • Leakage
  • Corrosion
  • Burn marks or overheating

Using a damaged cell significantly increases the risk of battery failure.

Safe Charging Practices

Battery safety begins with proper charging.

Always:

  • Use a charger designed for lithium-ion batteries.
  • Confirm the charger matches the battery's voltage specifications.
  • Charge on a non-flammable surface.
  • Monitor batteries while charging.

Never:

  • Overcharge or over-discharge a battery.
  • Leave batteries charging unattended.
  • Charge damaged cells.
  • Use incompatible charging equipment.

Safe Storage & Transportation

Improper storage is one of the leading causes of accidental battery incidents.

Never carry loose batteries in:

  • Pockets
  • Backpacks
  • Purses
  • Toolboxes
  • Bags containing metal objects

Contact with keys, coins, tools, or other conductive materials can create a short circuit capable of causing severe burns, fire, or explosion.

Always transport batteries inside protective, non-conductive battery cases.

Store batteries in a cool, dry environment away from excessive heat, moisture, and direct sunlight.

Understanding Thermal Runaway

Thermal runaway is a rapid chain reaction that causes a battery to generate excessive heat, potentially resulting in venting, fire, or explosion.

It may be caused by:

  • Overcharging
  • Short circuits
  • Physical damage
  • Excessive temperatures
  • Internal battery failure

Reducing these risks begins with proper charging, careful handling, and correct battery storage.

Never Do the Following

To reduce the risk of injury or property damage, never:

  • Short circuit a battery.
  • Crush, puncture, or modify the cell.
  • Expose batteries to fire, water, or excessive heat.
  • Charge or discharge outside the manufacturer's specifications.
  • Dispose of lithium-ion batteries in household trash.

Recycle batteries only through approved recycling facilities.

If a Battery Fails

Immediately stop using any battery that becomes unusually hot, swells, leaks, hisses, or emits smoke.

If it can be done safely:

  • Move the battery to a non-flammable surface such as concrete or sand.
  • Keep it away from combustible materials.
  • Allow the battery to cool from a safe distance.

For lithium-ion battery fires, an ABC dry chemical extinguisher may be used. Large amounts of water may also be effective for cooling lithium-ion cells and helping prevent fire spread. Continue monitoring the battery after the incident, as damaged cells may reignite.

If the fire cannot be safely controlled, evacuate the area immediately and contact emergency services.

CH-AmpX Product Disclaimer

CH-AmpX supplies lithium-ion batteries and battery components intended for knowledgeable users and professional battery pack builders.

Customers are responsible for ensuring that all batteries are used, charged, stored, transported, and installed according to manufacturer specifications, industry best practices, and applicable regulations.

CH-AmpX shall not be held liable for any injury, property damage, equipment failure, financial loss, or other damages resulting from:

  • Improper handling or misuse
  • Incorrect charging practices
  • Unauthorized modification
  • Improper storage or transportation
  • Failure to follow recommended safety procedures
  • Use outside manufacturer specifications

By purchasing from CH-AmpX, you acknowledge the inherent risks associated with lithium-ion batteries and accept full responsibility for their safe handling and use.

View Complete Safety Guide
Weight 0.1521 lbs

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