Samsung 21700 58E – High-Performance Lithium-Ion Battery

The Samsung 21700 model 58E is a high-quality lithium-ion rechargeable battery cell with a rated capacity of 5330 mAh. It is designed for flashlights and devices that require a stable and long-lasting power supply.

The battery supports a maximum discharge current of 15A and offers two charging modes—normal (2450 mA) and fast (4900 mA). This makes it a versatile choice for demanding users.

Technical Specifications

Specifications	Value
Type	21,700 INR
Model	58E
Rated Capacity	5,330 mAh
Minimum capacity	5,170 mAh
Rated voltage	3.6 V
Voltage at the end of charging	4.20 V
Voltage at the end of the discharge	2.5 V
Maximum discharge current	15 A
Normal charging	2,450 mA
Fast Charging	4,900 mA
Elevation	71 mm
Diameter	21.5 mm
Weight	71 years

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

Protected batteries contain a small circuit board near the anode or cathode. It protects the cell from overcharging, over-discharging, and excessive current. When critical thresholds are reached, the protection circuit automatically cuts off the power supply.

These batteries are slightly longer and wider than standard ones, so they are not compatible with all flashlights. They are suitable for devices from brands such as Acebeam, Olight, Fenix, Nitecore, and Armytec, which feature mechanical reverse-insertion protection.

Unprotected batteries conform to standard sizes and are intended for flashlights designed specifically for them—for example, models from Zebralight and Dulotec. Before purchasing, measure the size of the original battery in mm and compare it with the technical specifications of the new one.

How to Choose the Right Battery for Your Flashlight?

Measure the dimensions of the original battery in mm
Compare with the technical specifications of the new cage
Check whether the flashlight supports batteries with or without protection
If you have any questions, please contact us for advice

Instructions for Proper Use

Charge the battery using a high-quality lithium-ion charger before using it for the first time
Do not use in high temperatures or humid environments
Operating temperature during charging: 0°C to 45°C
Operating temperature when diluted: -20°C to 75°C
Storage temperature: -5°C to 35°C
Do not throw into fire or water
Do not crush, strike, or puncture the battery
Do not disassemble the cage
Keep out of reach of children
The battery may be hot after use—handle with care
If stored for more than 3 months without use, charge it before using it again

Safety Rules

Do not modify, disassemble, 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
Do not charge at sub-zero temperatures
Do not use if the foil is damaged
Store in a protective case, not in a pocket or purse

Frequently Asked Questions

What is the difference between a 21700 battery and an 18650 battery?

The 21700 format is larger than the classic 18650—its diameter is 21.5 mm compared to 18 mm, and its height reaches 71 mm. Thanks to their larger body, 21700 cells offer significantly higher capacity. The Samsung 58E, for example, has a rated capacity of 5,330 mAh, which is significantly more than most 18650 cells. Before replacing a battery, check to see if your device supports the 21700 format.

Is the Samsung 21700 58E battery protected?

The Samsung 58E is an unprotected cell, meaning it does not have a built-in protection circuit board. This means it is compatible with devices designed for standard-size batteries without additional components. If your flashlight requires a protected battery, please contact us so we can determine the appropriate option.

What kind of charger should I use to charge a Samsung 21700 58E battery?

Use a high-quality charger compatible with 21700-format lithium-ion cells. The battery supports normal charging at 2450 mA and fast charging at 4900 mA. It is important that the charger supports a charging voltage of 4.20 V. Do not charge at temperatures below 0°C or above 45°C.

What kinds of flashlights is this battery suitable for?

The Samsung 21700 58E is suitable for flashlights designed for unprotected 21700-format cells. Examples of brands whose models work with this type of battery include Zebralight and Dulotec. Flashlights from Acebeam, Olight, Fenix, Nitecore, and Armytec more often require a protected battery with a protruding positive terminal. Before purchasing, measure the original battery and compare the dimensions.

How do I properly store a 21700 lithium-ion battery?

Store the battery in a protective case in a dry, cool place. The recommended storage temperature is between -5°C and 35°C. Do not place the battery in a pocket or bag without a protective case, as contact with metal objects may cause a short circuit. If the battery is not used for an extended period—more than 3 months—charge it before using it again.

What is the maximum operating temperature for this battery?

During discharge (use), the battery operates within a temperature range of -20°C to 75°C. During charging, the permissible temperature range is 0°C to 45°C. Do not use or charge the battery outside these limits, as this may result in damage or a hazard.

Is it safe to use a battery with a damaged foil?

No. A battery with a damaged or compromised foil must not be used under any circumstances. The foil provides insulation and protection for the cell. Damage to the foil can lead to a short circuit, overheating, or, in extreme cases, a fire. Store and transport batteries carefully to preserve the integrity of the foil.