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

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

Specs:

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 ℃

*** WARNING ***

All users must have appropriate understanding of lithium-ion batteries before purchase. Use caution when working with and using lithium-ion batteries as they are very sensitive to charging characteristics and may explode, burn, or cause a fire if misused or mishandled. Always charge in or on a fire-proof surface. Never leave batteries charging unattended. Buyer is responsible for any damage or injury caused by misuse or mishandling lithium-ion batteries and chargers. No express or implied guarantee of compatibility with any device can be made. Charge only with a smart charger designed for this specific type of lithium-ion battery. Do not mix and match old and new, used and unused batteries.

• DO NOT USE WITH E-CIGARETTE, VAPORIZER, OR SIMILAR DEVICE
• MISUSING OR MISHANDLING LITHIUM-ION BATTERIES CAN POSE A SERIOUS RISK OF PERSONAL INJURY, PROPERTY DAMAGE, OR DEATH
• BATTERIES MAY EXPLODE, BURN, OR CAUSE A FIRE IF MISUSED OR MISHANDLED
• ONLY USE WITH PROPER CIRCUITRY IN A PROTECTED BATTERY PACK
• ONLY USE WITHIN MANUFACTURER LISTED SPECIFICATIONS
• DO NOT STORE LOOSE BATTERY IN A POCKET, PURSE ETC. - ALWAYS USE A PROTECTIVE CASE OR BOX
• KEEP AWAY from metal objects to prevent short circuiting
• DO NOT short circuit
• DO NOT use if wrapper or insulator is damaged or torn
• DO NOT use if damaged in any way
• DO NOT overcharge or over-discharge
• DO NOT modify, disassemble, puncture, cut, crush, or incinerate
• DO NOT expose to liquids or high temperatures
• DO NOT solder, spot weld only
• User must be familiar with handling lithium-ion batteries before purchase
• Usage of batteries is AT YOUR OWN RISK
• ALWAYS charge in or on a fire-proof surface and never leave charging batteries unattended