Molicel INR-21700-P42A 4200mAh 45A 3.7V High-Drain Li-ion Battery – 10C Discharge, ≤10mΩ Ultra-Low IR & -40°C Low-Temp Performance (Flat/Button/Welded/Wired/Protected Options, 2 Pcs)

Product Description:
The Molicel INR-21700-P42A is a flagship-grade 21700 lithium-ion battery cell engineered for extreme high-power, high-torque, and extreme low-temperature applications. This 2 Pcs bundle delivers a true 4200mAh capacity, a massive 45A (10C) continuous discharge current, and an ultra-low internal resistance of ≤10mΩ, providing explosive, sustained power for the most demanding devices.

Manufactured by Molicel, a global leader in high-performance battery technology, the P42A features exceptional low-temperature performance, capable of discharging reliably at temperatures as low as -40°C. It supports ultra-fast 90-minute charging and offers a 1000+ cycle life with ≥90% capacity retention. The built-in safety valve with an explosion-proof design safely vents internal gases to prevent swelling or rupture.

To suit your specific project needs, we offer 5 customized options:

1. Flat Top (2 Pcs): Standard 21mm x 70mm flat terminal (≤10mΩ IR).

2. Button Top (2 Pcs): 21mm x 73mm with a protruding nub for recessed contacts (~12mΩ IR).

3. Spot-Welded Tabs (2 Pcs): Pre-welded nickel strips for easy connection (~9mΩ IR).

4. Wired (Red/Black) (2 Pcs): Pre-soldered positive and negative wires for plug-and-play convenience (~9mΩ IR).

5. Built-in Protection Board (2 Pcs): Includes over-charge, over-discharge, and over-current protection (5A discharge limit; size: 21.5mm x 75mm).

Key Features:

• Authentic Molicel INR-21700-P42A Cell: Premium-grade, Taiwanese Molicel 21700 Li-ion battery.

• 4200mAh True Capacity: Provides 4200mAh of reliable energy for extended runtimes.

• 45A (10C) High Continuous Discharge: Delivers an extreme 45A power output, among the highest in the 21700 class.

• Ultra-Low Internal Resistance (≤10mΩ): Ensures minimal heat generation and maximum power transfer efficiency.

• -40°C Extreme Low-Temperature Performance: Discharges reliably even in extreme cold environments.

• 90-Minute Ultra-Fast Charging: Supports rapid recharging to get you back in action quickly.

• 1000+ Cycle Life (≥90% Retention): Offers excellent long-term value and durability.

• Built-In Safety Valve: Explosion-proof design safely releases internal gases in extreme conditions.

• Versatile 5 Options: Choose from Flat Top, Button Top, Welded Tabs, Wired, or Protected versions.

Product Parameters (Based on Molicel Official Spec Sheet):

• Brand: Molicel 

• Model: INR-21700-P42A

• Size: 21700

• Capacity: 4200mAh (Typical) / 4000mAh (Minimum)

• Nominal Voltage: 3.7V / 3.6V

• Full Charge Voltage: 4.2V

• Continuous Discharge Current: 45A (10C)

• Internal Resistance: ≤10mΩ (Flat/Welded/Wired) / ~12mΩ (Button)

• Charging Time: 90 minutes (Standard charge)

• Operating Temp - Discharging: -40°C to 60°C

• Cycle Life: ≥ 1000 cycles (≥90% retention after 1000 cycles)

• Safety: Positive terminal safety valve, explosion-proof design

• Dimensions (Based on Variant):

  • Flat Top / Welded / Wired: 21.4mm (Dia) x 70mm (H)

  • Button Top: 21.4mm (Dia) x 73mm (H)

  • Protected Board: 21.5mm (Dia) x 75mm (H)

• Pack Quantity: 2 Pcs (Selectable)

Applications:

• High-Torque Cordless Power Tools: Drives heavy-duty drills, impact drivers, and saws demanding 45A burst power.

• Extreme Cold & High-Altitude Equipment: Ideal for outdoor winter gear, cold-weather flashlights, and high-altitude drones.

• High-Performance RC Hobbies & Drones: Sustained high-current power for high-torque RC cars and heavy-lift drones.

• High-Capacity Portable Power Stations: Ideal core cell for building high-power portable energy storage systems.

• Professional Automotive & Industrial Equipment: High-performance reliability for demanding industrial machinery and tools.

Frequently Asked Questions (FAQ):

Q1: What is the discharge current of this P42A battery?
A1: The Molicel P42A is rated for an impressive 45A (10C) continuous discharge current. This is one of the highest in the 21700 class, making it the top choice for extreme power applications.

Q2: What is the advantage of the ≤10mΩ ultra-low internal resistance?
A2: ≤10mΩ means this battery generates virtually no heat and loses almost no energy during 45A high-current discharge. This maximizes performance and minimizes thermal stress on your equipment.

Q3: Can this battery be used in sub-zero temperatures?
A3: Yes. According to the official spec sheet, the Molicel P42A supports discharging down to -40°C with stable performance. It is the ideal choice for outdoor winter gear, polar expeditions, and high-altitude operations.

Q4: How fast can this battery charge?
A4: The Molicel P42A supports rapid charging, reaching a full charge in just 90 minutes using a compatible 8.4A charger.

Q5: What kind of charger should I use for this battery?
A5: You must use a high-quality charger specifically designed for 3.6V/3.7V Li-ion batteries with a 4.2V cut-off voltage. A smart charger capable of delivering 8.4A (1C) is recommended for optimal fast charging.