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The Samsung 25R is a proven high-drain 18650 cell built for applications that pull steady current and need consistent output. It’s a solid pick when the goal is reliable performance, not inflated “too good to be true” specs.
Key features
High-drain performance (20A continuous)
Built for demanding loads where weaker cells sag or overheat.
2500mAh capacity for balanced runtime
A practical mix of output + usable capacity.
Genuine Samsung SDI chemistry (INR)
Stable performance and strong cycle life when used correctly.
Flat top design for pack building
Commonly used in holders and welded pack assemblies.
Low self-discharge, consistent output
Reliable day-to-day behavior for both hobby and professional use.
Technical specifications
| Specification |
Details |
| Manufacturer |
Samsung SDI |
| Model |
INR18650-25R |
| Battery Type |
Lithium-ion (INR) |
| Capacity |
2500mAh |
| Continuous Discharge |
20A |
| Nominal Voltage |
3.6V |
| Max Charge Voltage |
4.2V |
| Cut-off Voltage |
2.5V |
| Terminal Type |
Flat Top |
| Dimensions |
~18.35mm × 65.05mm |
| Weight |
~43g |
Compatibility notes (read before buying)
This is where returns and safety issues happen, so this section is written for clarity.
Flat top vs button top
Flat top cells are common in pack builds and some holders.
If your device requires a button top, this may not make contact without an adapter or redesign.
Protected vs unprotected
This is an unprotected cell.
For packs, a BMS is required. For loose single-cell device use, only use it in equipment designed for unprotected high-drain cells.
FAQ Questions
1: Is the Samsung 25R a high-drain battery?
Yes, it supports a continuous discharge of 20A, making it suitable for high-drain devices.
2: Is this battery protected or unprotected?
This is an unprotected flat-top 18650 cell and should be used with a BMS or protection circuit.
3: What devices is the Samsung 25R best for?
Battery packs, power tools, high-output LEDs, and DIY electronics.
4: Is this a genuine Samsung battery?
Yes, all cells are authentic Samsung SDI products.
