Vapcell A1840 – 18650 battery with a capacity of 4000mAh

The Vapcell A1840 is a high-quality 18650-format lithium-ion rechargeable battery cell with a rated capacity of 4000mAh and a maximum continuous discharge current of 10A. Manufactured in China, it is suitable for a wide range of devices requiring a reliable and stable power supply.

Key Features

Type: INR 18650, model A1840 with a flat positive terminal
Rated capacity: 4000mAh
Minimum capacity: 3,850 mAh
Rated voltage: 3.6V
Maximum continuous discharge current: 10 A
Charging end voltage: 4.20V
Discharge-end voltage: 2.5V
Normal charging: 1500 mA
Fast charging: 2000 mA
Weight: 47.4 g
Dimensions: 18 mm in diameter, 65 mm in height
No protection board

A battery with or without protection—what's the difference?

Protected batteries contain a small circuit board embedded in the anode or cathode. It protects the cell from overcharging, over-discharging, and excessive current. In such situations, the protection circuit automatically shuts down the battery.

Protected batteries often have a protruding positive terminal and are suitable for flashlights with mechanical reverse-polarity protection—typically found in brands such as Acebeam, Olight, Fenix, Nitecore, and Armytec. They are slightly longer and wider than standard cells due to the additional components.

Unprotected batteries, such as this Vapcell A1840, are intended for devices designed for a standard size—for example, flashlights from Dulotec and Zebralight. Some devices require a higher current, which protected batteries cannot provide.

To select the correct battery, measure the dimensions of the original cell in millimeters and compare them with the technical specifications. If necessary, you can contact the Dulotec.COM team for assistance.

Instructions for Use

Charge the battery using a high-quality lithium-ion charger before using it for the first time.
Do not use or store in high temperatures or humid environments.
Operating temperature during charging: 0°C to 45°C; during discharging: -20°C to 75°C.
Storage temperature: -5°C to 35°C.
Do not throw into fire or water—risk of fire or explosion.
Do not crush, strike, or disassemble the battery.
Keep out of reach of children.
The battery may be hot after use—handle with care.
If the product has not been used for more than 3 months, charge it before use.

Safety Rules

Do not modify, puncture, cut, or short-circuit the device.
Do not expose to water, fire, or extreme temperatures.
Do not use in defective devices.
Do not overcharge or undercharge the battery; do not charge it at sub-zero temperatures.
Do not use if the battery wrap is damaged.
Store in a protective case—not in a pocket or purse.

Specifications	Value
Brand	Vapcell
Model	A1840
Type	18,650 INR
Rated Capacity	4,000 mAh
Minimum capacity	3,850 mAh
Rated voltage	3.6V
Maximum discharge current	10A
Voltage at the end of charging	4.20 V
Voltage at the end of the discharge	2.5V
Normal charging	1500 mA
Fast Charging	2000 mA
Weight	47.4 g
Diameter	18 mm
Elevation	65 mm
Type Plus	Flat
Defense	Unprotected
Origin	China

Frequently Asked Questions

What is the difference between a battery with protection and one without?

An unprotected battery, such as the Vapcell A1840, does not have a built-in current control circuit. Protected batteries do have such a circuit, which protects the cell from overcharging, over-discharging, and excessive current. Protected cells are slightly longer and wider. Not all flashlights and devices are compatible with both types, so it’s important to check the specific device’s requirements before purchasing.

What devices is the Vapcell A1840 battery suitable for?

This battery is suitable for devices designed for a standard 18650 cell without protection. Examples include flashlights from the Dulotec and Zebralight brands. If your device requires a battery with a protruding positive terminal or built-in protection, this cell may not be suitable. We recommend checking your device’s specifications or contacting us for clarification.

How do I figure out which 18650 battery I need?

The surest way is to measure the dimensions of the original battery in millimeters and compare them with the technical specifications of the new cell. Check whether the device requires a flat or raised positive terminal, and whether protection is necessary. If in doubt, you can contact the Dulotec.COM team, who will help you choose the right cell.

What kind of charger should I use to charge the Vapcell A1840?

Use a high-quality charger designed for lithium-ion rechargeable cells. Normal charging is at 1500 mA, and fast charging is at 2000 mA. Do not charge at temperatures below 0°C. It is recommended that the charger support the 18650 format and have overcharge protection.

How do I store an 18650 battery properly?

Store the battery in its protective case in a dry, cool place at a temperature between -5°C and 35°C. Do not place it in a pocket or bag without protection, as contact with metal objects may cause a short circuit. If the battery has not been used for more than 3 months, charge it before use.

Is an 18650 battery dangerous if used improperly?

Yes, lithium-ion cells can catch fire or explode if used improperly. Do not expose them to fire, water, or extreme temperatures. Do not crush, puncture, or short-circuit them. Do not use cells with damaged foil. Follow all safety instructions included in the product description.

What is the operating temperature of the Vapcell A1840?

During charging, the operating temperature ranges from 0°C to 45°C. During discharging, the cell can operate within a range of -20°C to 75°C. The storage temperature is between -5°C and 35°C. Do not expose the battery to conditions outside these limits to maintain its performance and safety.

Weight

0,05 kg

Dimensions

1,8000 cm