Vapcell K54 26650 Battery – High Capacity and Reliable Discharge Current

The Vapcell K54 is a 26650-format lithium-ion battery with a rated capacity of 5400mAh and a continuous discharge current of 15A. It is suitable for flashlights and devices that require a powerful and stable power supply.

The battery has a protruding positive terminal, which makes it compatible with flashlights in which two or more batteries must make contact with each other.

Key Features

Rated capacity: 5400mAh
Minimum capacity: 5250mAh
Rated current (continuous): 15 A
Rated voltage: 3.7V
Charging end voltage: 4.20V
Discharge-end voltage: 2.5V
Internal resistance: 19 mΩ (approximate, AC 1 kHz)
Normal charging: 2000 mA, CCCV with cut-off at 100 mA
Fast charging: 4000 mA
Dimensions: 26.4 × 65.1 mm
Weight: 98 g (approximately)
Tip type: protruding plus—ensures contact in flashlights with two or more batteries

A battery with or without protection?

Protected batteries contain a small circuit board in the anode or cathode. It protects the cell from overcharging, over-discharging, and excessive current by automatically shutting off when necessary.

Protected batteries are slightly longer and wider than standard ones. They are suitable for flashlights with mechanical reverse-polarity protection—a feature typical of brands such as Acebeam, Olight, Fenix, Nitecore, and Armytec. They are not suitable for flashlights such as Zebralight and Dulotec, which are designed specifically for unprotected batteries.

Some flashlights require a higher current, which protected batteries generally cannot provide. The easiest way to choose the right battery is to measure the original cell in millimeters and compare it to the technical specifications of the new one.

Operating Temperatures

Charging: 0°C to 45°C
Operating temperature: -20°C to 75°C
Storage: -5°C to 35°C

Instructions for Use

Charge the battery using a high-quality lithium-ion battery charger before using it for the first time.
Do not use or store in high temperatures or humid environments.
Do not throw into fire or water—the battery may catch fire or explode.
Do not crush or strike the battery.
Do not disassemble.
Keep out of reach of children.
The battery may be hot after use—handle with care.
If the device has not been used for more than 3 months, charge it before using it again.

Safety Rules

If used improperly, the battery may catch fire or explode. Follow these guidelines:

Do not modify, disassemble, drill, cut, or short-circuit the device.
Do not expose to water, fire, or high temperatures.
Do not use in defective devices.
Do not overcharge or undercharge the battery. Do not charge the battery at sub-zero temperatures.
Do not use if the battery wrap is damaged or compromised.
Do not carry it in your pocket or purse without a protective case.

Specifications	Value
Brand	Vapcell
Model	K54
Format	26650
Rated Capacity	5,400 mAh
Minimum capacity	5250 mAh
Discharge Current (Continuous)	15A
Rated Voltage	3.7V
Voltage at the end of charging	4.20 V
Voltage at the end of the discharge	2.5V
Internal Resistance	19 mΩ (approximate, AC 1 kHz)
Normal charging	2000 mA, CCCV, cut-off at 100 mA
Fast Charging	4,000 mA
Dimensions	26.4 × 65.1 mm
Weight	98 years (approximately)
Peak Type	A major advantage
Filling Temperature	0°C to 45°C
Dilution Temperature	-20°C to 75°C
Storage Temperature	-5°C to 35°C

Frequently Asked Questions

What is the difference between a battery with a raised positive terminal and one with a flat positive terminal?

The Vapcell K54 26650 battery has a protruding positive terminal. This means that the top terminal protrudes slightly outward. This configuration is necessary for flashlights in which two or more batteries must make direct contact with each other. Batteries with a flat positive terminal cannot provide reliable contact in such devices. Before purchasing, check the manual for your flashlight or device to make sure you know which type of terminal is required.

Is the Vapcell K54 26650 battery protected?

The information provided does not explicitly state whether this battery has a built-in protection circuit or not. Batteries with protection circuits are slightly longer than standard ones and are not suitable for all flashlights. If you have any doubts about compatibility, we recommend measuring the original battery in your device and comparing it to the dimensions of the K54—26.4 x 65.1 mm. You can contact the Dulotec.COM team for further clarification.

What is the maximum charging speed of the Vapcell K54?

The battery supports two charging modes. Normal charging is performed at 2000 mA using the CCCV method, with the current cut off at 100 mA. Fast charging is possible at currents up to 4000 mA. To ensure a long battery life, we recommend using a high-quality charger designed for lithium-ion cells. Do not charge at temperatures below 0°C.

At what temperatures can this battery be used and stored?

The Vapcell K54 26650 battery can be charged at temperatures between 0°C and 45°C. Discharging is permitted over a wider range—from -20°C to 75°C. A storage temperature between -5°C and 35°C is recommended. Avoid exposure to moisture or direct flame under all conditions of use.

What types of flashlights is the Vapcell K54 26650 battery suitable for?

This battery is suitable for flashlights designed for the 26650 format and requiring a protruding positive terminal. It is also suitable for devices in which two or more batteries must be connected in series. Flashlights such as Zebralight and those from the Dulotec series, which are designed for unprotected batteries with a flat positive terminal, may not be compatible. It is recommended that you check your flashlight’s documentation or consult the seller before purchasing.

How should we properly store the Vapcell K54 battery?

The battery must be stored in a protective case—never in a pocket or bag without protection. The recommended storage temperature is between -5°C and 35°C. If the battery has not been used for more than 3 months, charge it before using it again. Do not expose it to water, fire, or high temperatures, and do not store it in devices with damaged foil.

How can I tell which replacement battery is right for my flashlight?

The most reliable way is to measure the original battery in your flashlight in millimeters and compare it to the technical specifications of the new one. For the Vapcell K54, the dimensions are 26.4 x 65.1 mm. Also check whether the flashlight requires a protruding or flat positive terminal, as well as whether it is compatible with batteries without built-in protection. If in doubt, contact the Dulotec.COM team, who will help you choose the right option.