Keeppower 26650 5500mAh Battery with High-Discharge Protection

13,00 €

Type: 26650
Capacity: 5500mAh
Dimensions: (Height) 69.5 mm (Diameter) 26.4 mm
Voltage: 3.6V

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Keeppower 26650 Rechargeable Battery, 5500mAh, with Built-in Protection

The Keeppower P2655C is a high-capacity 26650-format lithium-ion rechargeable battery with a capacity of 5500mAh. It is manufactured in China with a high-quality cell and a built-in protection circuit.

Key Features

Capacity: 5,500 mAh
Maximum voltage: 4.2 V
Rated voltage: 3.6 V
Over 500 charge-discharge cycles
Dimensions: height 69.50 mm, diameter 26.40 mm
A major advantage—ensures a connection in flashlights with two or more batteries
Built-in protection against: overcharging, over-discharging, overcurrent, and short circuits

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

Batteries with built-in protection contain a small circuit board in the anode or cathode. It protects the cell from overcharging, over-discharging, and excessive current—in case of danger, the protection system automatically shuts off.

These protected batteries are slightly longer and wider than standard ones. They are suitable for flashlights with mechanical reverse-insertion protection—for example, models from Acebeam, Olight, Fenix, Nitecore, Armytec, and similar brands.

They are not suitable for flashlights such as Zebralight and Dulotec, which are designed for unprotected batteries. Some flashlights require a higher current, which protected batteries cannot provide.

The easiest way to choose the right battery is to measure the original one in millimeters and compare it with the technical specifications. If you have any questions, please contact us for assistance.

Instructions for Use

Charge the battery using a high-quality lithium-ion charger before using it for the first time.
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 expose to fire, water, or high humidity.
Do not crush, strike, or disassemble the battery.
Keep out of reach of children.
The battery may be warm after use—handle with care.
If stored for more than 3 months without use, charge it before using it again.
Store in a protective case—not in a pocket or purse.

Safety Rules

The battery may catch fire or explode if used improperly. Please observe the following:

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 charge at sub-zero temperatures.
Do not use the battery if the foil is damaged.
Do not recharge or force-discharge the battery.

Specifications	Value
Brand	Keeppower
Model	P2655C
Category	Rechargeable battery
Format	26650
Capacity	5,500 mAh
Rated voltage	3.6 V
Maximum voltage	4.2 V
Built-in Protection	Yes—protection against overcharging, over-discharging, overcurrent, and short circuits
Number of cycles	Over 500
Elevation	69.50 mm
Diameter	26.40 mm
Type Plus	Prominent
Operating Temperature – Charging	0°C to 45°C
Operating temperature – dilution	-20°C to 75°C
Storage Temperature	-5°C to 35°C

Frequently Asked Questions

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

The battery with built-in protection contains a small electronic circuit board that monitors voltage and current. In the event of overcharging, over-discharging, or overcurrent, it automatically shuts down the battery. Protected batteries are slightly longer and wider than standard ones, as the circuit board adds bulk. Unprotected batteries are more compact and can deliver higher current, but they require more careful use and compatible chargers.

What types of flashlights is the Keeppower P2655C suitable for?

This battery is suitable for flashlights designed to use the 26650 format and equipped with mechanical reverse-insertion protection. These include models from Acebeam, Olight, Fenix, Nitecore, and Armytec. It is not suitable for flashlights such as Zebralight and Dulotec, which require batteries without protection. Before purchasing, measure your original battery in millimeters and compare it to the dimensions of the P2655C—height 69.50 mm and diameter 26.40 mm.

How many charge cycles does the Keeppower 26650 5500mAh battery last?

The Keeppower P2655C battery is designed for over 500 charge-discharge cycles. To preserve its capacity for longer, it is important to charge it with a suitable lithium-ion charger and to avoid over-discharging or forced recharging. Proper storage at temperatures between -5°C and 35°C also extends the battery’s life.

At what temperature can the battery be charged and used?

The battery can be charged at temperatures between 0°C and 45°C. During discharge, the operating range is wider—from -20°C to 75°C. Storage should take place at temperatures between -5°C and 35°C. Charging at sub-zero temperatures is not recommended, as this may damage the cell.

How should I store the battery if I'm not going to use it for a long time?

If stored for more than 3 months, it is recommended that the battery be charged before its next use. Store it in a protective case—never in a pocket or bag without a protective cover. Avoid damp environments and direct sunlight. The optimal storage temperature is between -5°C and 35°C.

What safety precautions should I follow when using this product?

Do not crush, puncture, or disassemble the battery. Do not expose it to fire, water, or extreme temperatures. Do not use the battery if the protective film is damaged. Do not intentionally short-circuit the battery. Keep out of reach of children. If the battery becomes hot after use, handle it with care. Any violation of these rules may result in a fire or explosion.

How can I tell if this battery is right for my flashlight?

The most reliable way is to measure the original battery in your flashlight in millimeters and compare those measurements to the dimensions of the Keeppower P2655C—69.50 mm in height and 26.40 mm in diameter. If the dimensions match and your flashlight supports batteries with a protruding positive terminal and built-in protection, the battery is suitable. If in doubt, contact the Dulotec.COM team for specific recommendations.