The Weltool INR21-40P (INR21-40P) is a 21700 rechargeable battery engineered for high-performance flashlights and demanding electronic devices. With a 4000mAh capacity and a 40A maximum discharge, this high-drain Li-ion cell delivers stable, long-lasting power for high-output and tactical lights. Low internal resistance and a compact 70g build make it a dependable choice for enthusiasts.
Highlights
4000mAh capacity (minimum 3950mAh) for extended runtime
40A continuous discharge for high-drain devices
Low internal resistance (≤12mΩ) for stable output
~250 charge cycles with 60% capacity retention
Compact and light — 21.3mm diameter, only 70g
Specifications
Model
INR21-40P
Format
21700 Li-ion
Capacity
4000mAh (min. 3950mAh)
Nominal voltage
3.6V
Continuous discharge
40A @ 25°C
Max charge current
6A
Internal resistance
≤12mΩ
Cycle life
~250 cycles (60% retention)
Dimensions
≤21.3mm dia. x ≤70.3mm length
Weight
≤70g
Frequently Asked Questions
What is the Weltool INR21-40P (INR21-40P) battery?
The Weltool INR21-40P (INR21-40P) is a 4000mAh 21700 high-drain rechargeable Li-ion battery built to power high-output flashlights and demanding devices.
What is the capacity of the Weltool INR21-40P (INR21-40P)?
The Weltool INR21-40P (INR21-40P) has a 4000mAh rated capacity (minimum 3950mAh) with a 3.6V nominal voltage.
How much current can the Weltool INR21-40P (INR21-40P) deliver?
The Weltool INR21-40P (INR21-40P) supports up to 40A continuous discharge at 25°C, making it a true high-drain cell.
How long does the Weltool INR21-40P (INR21-40P) last?
The Weltool INR21-40P (INR21-40P) is rated for about 250 charge cycles while retaining roughly 60% of its capacity.
What devices use the Weltool INR21-40P (INR21-40P)?
The Weltool INR21-40P (INR21-40P) fits flashlights and electronics that take a 21700 cell, and is optimized for high-output and tactical flashlight models.
Where can I buy the Weltool INR21-40P (INR21-40P)?
You can buy the Weltool INR21-40P (INR21-40P) at Going Gear. Going Gear is an authorized Weltool dealer.
