The Samsung INR18650-25R is a rechargeable high-drain lithium-ion cell (Li-ion cell) built for assembling and rebuilding battery packs. It fits e-bike packs, electric scooter packs, power tool batteries and other high-load devices. Capacity is 2500 mAh, maximum discharge current reaches 20 A, and nominal voltage sits at 3.6 V.
Samsung SDI, the battery division of the Samsung group, manufactures this cell. The body follows the standard 18650 format: 18.20 mm diameter, 65.00 mm height and roughly 45 g of weight. The contact is flat top, so nickel strips attach cleanly by spot welding. Chemistry is Li-ion of the INR (NMC) type.
One point matters before ordering. This is an unprotected cell, without an integrated discharge and overcharge protection board. Therefore it works alongside a BMS or a charger with a correct cut-off threshold. For that reason the 25R suits experienced pack builders rather than direct swaps inside household appliances.
Key Benefits
- 20 A maximum discharge current — a genuine high-drain cell that holds up under heavy loads.
- 2500 mAh capacity — a balance between energy reserve and strong current delivery.
- Samsung SDI production — among the most recognised high-drain 18650 cells on the market.
- Standard 18650 format — 18.20 mm by 65.00 mm fits common holders and pack frames.
- Flat top contact — convenient for spot welding with nickel strips.
- ~45 g weight — total pack mass and energy density stay easy to plan.
- Clear voltage limits — 4.2 V maximum charge, 2.5 V minimum discharge, 3.6 V nominal.
Who Is This Cell For?
The Samsung INR18650-25R goes into e-bike and electric scooter battery packs where steady high current is the priority. In addition, it serves power tools and other equipment drawing up to 20 A. Builders choose it for new pack assembly, cell replacement in ageing packs and DIY energy projects.
Technicians working with BMS boards and spot welding equipment are the natural audience here. Because the cell is unprotected, it is not intended for standalone use in household devices. A protection circuit or a suitable charger must first keep the 4.2 V and 2.5 V limits in place.
Technical Specifications
| Model | Samsung INR18650-25R |
| Manufacturer | Samsung SDI |
| Type | 18650 lithium-ion cell |
| Chemistry | Li-ion (INR / NMC) |
| Capacity | 2500 mAh |
| Nominal voltage | 3.6 V |
| Maximum charge voltage | 4.2 V |
| Minimum discharge voltage | 2.5 V |
| Maximum discharge current | 20 A |
| Rechargeable | Yes |
| Contact type | Flat top |
| Discharge and overcharge protection | Unprotected |
| Diameter | 18.20 mm |
| Height | 65.00 mm |
| Weight | ~45 g |
Why Choose the Samsung INR18650-25R?
This cell pairs 2500 mAh of capacity with a 20 A discharge capability. Many higher-capacity 18650 cells simply cannot sustain such currents. Consequently, the 25R is picked wherever current matters more than maximum runtime.
Samsung SDI produces cylindrical, prismatic and pouch lithium-ion cells for electric vehicles, energy storage systems and power tools. As a result, the 25R remains one of the most proven high-drain cells in pack building. The stated 18.20 × 65.00 mm dimensions and ~45 g weight let you plan pack geometry and total mass precisely. Moreover, the flat contact simplifies nickel strip welding.
FAQ
What is the capacity of the Samsung INR18650-25R?
- Capacity is 2500 mAh.
- Nominal voltage is 3.6 V.
What is the maximum discharge current of this cell?
- Maximum discharge current is 20 A.
- That figure refers to discharge, not charging.
What are the voltage limits of the INR18650-25R?
- Maximum charge voltage: 4.2 V.
- Minimum discharge voltage: 2.5 V.
Is this cell suitable for e-bike and electric scooter battery packs?
- Yes, it is used in e-bike and electric scooter packs needing steady high current.
- Loads up to 20 A are within its rating.
Can I use the Samsung 25R in power tool batteries?
- Yes, power tool packs are a common application.
- Pair it with a BMS or a charger with the correct cut-off.
Is the Samsung INR18650-25R protected?
- No, it is an unprotected cell with no built-in protection board.
- A BMS or suitable charger is required.
What contact type does this cell have?
- Flat top.
- Nickel strips can be spot welded directly onto it.
What are the dimensions and weight?
- Diameter 18.20 mm, height 65.00 mm.
- Weight is approximately 45 g.
With 2500 mAh, a 20 A discharge rating and a flat top in the standard 18650 format, the Samsung INR18650-25R remains a dependable building block for e-bike, scooter and power tool packs. Plan it into your BMS-equipped design and keep charging within 4.2 V and 2.5 V.
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