Power Your High-Drain Devices
Power your high-drain devices with the legendary Samsung 25R 18650 Battery (Model: INR18650-25R). Widely regarded as the industry standard for reliable high-power performance, this 18650 lithium-ion cell delivers a solid 2500mAh capacity paired with a stable 20A continuous discharge (short pulse up to 35A). The Samsung 25R has earned its reputation as one of the most versatile and trusted cells on the market, offering the perfect balance between power output and runtime for a wide range of applications. This listing offers three terminal options to suit your specific needs: Flat Top for most modern devices (flashlights, power tools); Button Top for older equipment with spring-loaded contacts; and Nickel Tab – pre-welded with nickel strips for easy, solder-free DIY battery pack assembly. Whether you are powering a high-wattage mod, upgrading a cordless power tool, or building a custom DIY battery pack, the Samsung 25R provides consistent, safe, and reliable energy. This listing includes one individual cell (multi-pack options available), offering the trusted quality and longevity that Samsung is famous for.
Key Features
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High 20A Continuous Discharge
Delivers a stable 20A continuous current, perfect for high-drain applications like advanced power tools, mods, and high-lumen flashlights. Supports short pulse discharges up to 35A for burst power needs. -
Solid 2500mAh Capacity
Provides 2500mAh of reliable capacity, offering a practical balance between power output and runtime. Ideal for devices that need sustained power without sacrificing too much runtime. -
Three Terminal Options – Choose Your Fit
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Flat Top – Standard flat positive terminal, compatible with most modern flashlights, power tools, and DIY battery packs.
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Button Top – Raised positive terminal (like a standard AA battery), required for older devices and specific flashlight models with spring-loaded contacts.
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Nickel Tab – Pre-welded nickel strips on the positive and negative terminals, ready for solder-free battery pack assembly, saving you time and effort.
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Proven Track Record
One of the most popular and widely used 18650 cells in the flashlight, mod, and DIY communities, trusted by enthusiasts worldwide for over a decade. -
Authentic Samsung Quality
Premium-grade INR18650-25R cells from one of the world's most trusted battery manufacturers, ensuring exceptional cycle life, safety certifications, and consistent voltage stability. -
Versatile Performance
Suitable for a wide range of applications, from high-power mods, power tools, flashlights, and custom battery pack building.
Technical Parameters
| Parameter | Value |
|---|---|
| Brand & Model | Samsung INR18650-25R |
| Battery Type | Lithium-Ion (Li-Ion) |
| Size | 18650 (Diameter 18mm, Height 65mm) |
| Capacity | 2500mAh (Minimum 2400mAh) |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Cut-off Voltage | 2.5V |
| Continuous Discharge Current | 20A |
| Pulse Discharge Current | Up to 35A (short pulses only, not for continuous use) |
| Terminal Options | Flat Top / Button Top / Nickel Tab (select at checkout) |
| Internal Resistance | ~15-18mΩ (Typical) |
| Protection Circuit | No (Unprotected Cell) |
| Operating Temperature | -20°C to 60°C |
| Quantity in Package | 1 Cell |
Applications
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Power Tools
Upgrading cordless drills, impact drivers, and other handheld power tools for longer work sessions. -
High-Lumen Flashlights & Headlamps
Powering tactical flashlights, searchlights, and headlamps that require sustained brightness and reliable runtime. -
DIY Battery Packs
Creating custom 1S, 2S, 3S, or larger battery banks for robotics, drones, or portable power stations. The Nickel Tab option is perfect for solder-free assembly. -
Outdoor & Camping Gear
Powering portable fans, heated jackets, camping lights, and other outdoor electronics. -
Portable Power Stations
Building compact yet powerful battery banks for camping, emergency power, or off-grid applications.
FAQ
Q1: What is the difference between Flat Top, Button Top, and Nickel Tab?
A:
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Flat Top has a flat positive terminal. It fits most modern devices (flashlights, power tools).
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Button Top has a raised positive terminal (like a standard AA battery). It is required for older devices and certain flashlights with spring-loaded contacts.
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Nickel Tab comes with nickel strips pre-welded to the positive and negative terminals. This is ideal for DIY battery pack building – no soldering required, just spot welding or direct connection.
Q2: How does Samsung 25R compare to Samsung 30Q and 20S?
A: The Samsung 25R offers a balanced choice – 2500mAh capacity with 20A continuous discharge. The 30Q has higher capacity (3000mAh) but lower discharge (15A). The 20S has higher discharge (30A) but lower capacity (2000mAh). Choose the 25R if you want a reliable middle ground for a wide range of applications.
Model Comparison Table
| Model | Capacity | Continuous Discharge | Best For |
|---|---|---|---|
| Samsung 25R | 2500mAh | 20A | Balanced (mods, tools, flashlights) |
| Samsung 30Q | 3000mAh | 15A | Long runtime (flashlights) |
| Samsung 20S | 2000mAh | 30A | Extreme power (mechanical mods, heavy tools) |
Q3: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The Samsung 25R is an unprotected cell. It relies on the external device or a BMS (Battery Management System) to handle overcharge, over-discharge, and short-circuit protection.
Q4: What charger should I use?
A: Use a dedicated intelligent Li-Ion charger designed for 3.6V/4.2V cells. Ensure the charger supports the correct voltage for your specific pack setup (e.g., 1S charger for single cells, 2S charger for 2 cells in series, etc.).
Q5: How do I identify positive and negative terminals?
A: The flat top (or the raised button on button top version) is the Positive (+) terminal. The bottom (the side with the shiny metal casing and a slight indentation) is the Negative (-) terminal.
Q6: Is the Samsung 25R still a good battery in 2026?
A: Absolutely. The Samsung 25R remains one of the most popular and trusted 18650 cells on the market. Its 20A discharge and 2500mAh capacity offer a perfect balance for countless applications. It continues to be a top choice for flashlight enthusiasts, modders, and DIY builders worldwide.
