Skip to content
Free shipping on orders over $100!
Free shipping on orders over $100!

Weltool INR21-40P High-Drain 21700 Li-ion battery 4000mAh

Sold out
Original price $ 10.00 - Original price $ 10.00
Original price
$ 10.00
$ 10.00 - $ 10.00
Current price $ 10.00

Free shipping for orders over $100. Any order containing lithium batteries is at risk of abnormal shipping delays. UPS is highly recommended for any order containing batteries. UPS Ground is required for orders only containing batteries and not meeting the free shipping threshold even if other options are available during checkout.

Weltool INR21-40P High-Drain 21700 Li-ion battery 4000mAh


Weltool INR series lithium-ion batteries are original cells without additional protection circuits. Make sure not to overdischarge or overcharge this battery while in use. 

This INR21-40P is a high drain battery with a maximum discharge current of 45A.

Model: INR21-40P

Capacity: 4000mAh

Internal resistance: ≤12mΩ

Voltage: 3.65V

Continuous discharge current : 45A(-20-60 ℃)

Max. charger charging current:  6A (15℃- 45℃)

Standard charging current:2A(25℃ ± 2℃)

Overcharge protection voltage: 4.2±0.05V

Over-discharge protection voltage: 2.5±0.1V

Cycle charge and discharge times: 300 times, the battery has 60% capacity

Charging temperature: +0~+45 ℃

Discharge temperature: -20~+60℃

Storage temperature: -20~+40℃ (Less than 3 months)

Dimensions: 21.0±0.2 mm (diameter), 70.4±0.2 mm (length)

Weight: 66±2g


Warnings :

Do not immerse the battery in water.

Do not place it near a heat source such as a fire source or heater.

Do not use over-discharge. Stop discharging when the battery voltage drops to 2.75 V.

When charging, use a professional charger with overcharge protection.

Do not reverse the positive and negative poles.

Do not connect the positive and negative terminals directly to metal objects.

Do not pierce the battery with nails or other sharp objects.

Do not disassemble or modify the battery.

by Weltool

Customer Reviews

Be the first to write a review