Samsung INR21700-50S

Samsung Battery Cell

In brief: 21700 Li-ion battery cell. 5000mAh capacity. 25A continuous discharge.

Specs verified Oct 18, 2026

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Prices tracked across 3 sellers

18650 Battery

IMR Batteries

18650 Battery Store

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Current best price $6.99. Over the past 90 days: low $6.99, high $7.99, average $7.36 — down 5% vs average.

18650 Battery
18650 Battery Store
IMR Batteries

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Specifications

Cell Specs

Form Factor: 21700
Chemistry: Li-ion
Capacity: 5000mAh
Continuous Discharge: 25.00A

Physical

Weight: 71 g
Dimensions (L×W×H): 71mm × 21mm × 21mm

Resources

Official Batemo Page

Manufacturer Page<p>Get everything you need for the lithium-ion battery cell Samsung INR21700-50S: Extensive measurement data in the total operation regime, a high-precision, physical battery model with global validity, and a teardown report that contains all details about materials and microstructures.</p> <table> <colgroup> <col width="50%"> <col width="50%"> </colgroup> <tbody> <tr> <td>Cell Origin</td> <td style="text-align:right">purchased on free market</td> </tr> <tr> <td>Cell Format</td> <td style="text-align:right">21700</td> </tr> <tr> <td>Dimensions</td> <td style="text-align:right">21.1 x 70.6 mm</td> </tr> <tr> <td>Weight</td> <td style="text-align:right">70.6 g</td> </tr> <tr> <td>Capacity<br> <span class="collapseomatic noarrow" id="id699f65fb6de0e" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id699f65fb6de0e" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id699f65fb6de0e" class="collapseomatic_content collapsible_orange"> The nominal capacity originates from the manufacturer’s data sheet, if available. When the data sheet is unavailable, the nominal capacity is estimated. Batemo measured the C/10 capacity by discharging the cell at an ambient temperature of 25°C from 100% with a constant current of 0.50A (0.1C) until reaching the voltage of 2.0V. The thermal boundary condition is free convection.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">nominal</span> 5.00 Ah<br> <span style="font-size: 10px">C/10</span> 5.04 Ah</td> </tr> <tr> <td>Current<br> <span class="collapseomatic noarrow" id="id699f65fb6de89" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id699f65fb6de89" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id699f65fb6de89" class="collapseomatic_content collapsible_orange"> All quantities are measurement results from the Batemo battery laboratory.<br> The continuous current is the highest current that completely discharges the cell without overheating it. Therefore, the cell is discharged from 100% state of charge (SOC) at an ambient temperature of 25°C with a constant current until a residual state of charge of 10% and either the lower voltage limit of 2.0V or 90% of the maximum surface temperature (72°C) is reached.<br> The peak current is the current that the cell can supply for 5 minutes. The cell is therefore discharged from 100% SOC at an ambient temperature of 25°C with a constant current until it reaches either the lower voltage limit of 2.0V or the maximum surface temperature of 80°C after 5 minutes. For cells that reach the maximum surface temperature, the measured current is taken directly as the peak current. For cells that do not reach the maximum surface temperature after 5 minutes because they reach the lower voltage limit first, the measured current is multiplied by a correction factor that estimates the current that would have heated the cell to the maximum surface temperature within 5 minutes.<br> The thermal boundary condition is free convection. These operating conditions may be outside the cell manufacturer’s specification.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">continuous</span> 16.9 A<br> <span style="font-size: 10px">peak</span> 29.2 A</td> </tr> <tr> <td>Energy<br> <span class="collapseomatic noarrow" id="id699f65fb6dedb" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id699f65fb6dedb" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id699f65fb6dedb" class="collapseomatic_content collapsible_orange"> Batemo measured the C/10 energy by discharging the cell at an ambient temperature of 25°C from 100% with a constant current of 0.50A (0.1C) until reaching the voltage of 2.0V. The thermal boundary condition is free convection.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">C/10</span> 18.3 Wh</td> </tr> <tr> <td>Power<br> <span class="collapseomatic noarrow" id="id699f65fb6df24" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id699f65fb6df24" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id699f65fb6df24" class="collapseomatic_content collapsible_orange"> All quantities are measurement results from the Batemo battery laboratory.<br> The continuous power is the highest power that completely discharges the cell without overheating it. Therefore, the cell is discharged from 100% state of charge (SOC) at an ambient temperature of 25°C with a constant current until a residual state of charge of 10% and either the lower voltage limit of 2.0V or 90% of the maximum surface temperature ( 72°C) is reached.<br> The peak power is the power the cell can supply for 5 minutes. The cell is therefore discharged from 100% SOC at an ambient temperature of 25°C with a constant current until it reaches either the lower voltage limit of 2.0V or the maximum surface temperature of 80°C after 5 minutes. For cells that reach the maximum temperature limit, the measured power is directly taken as peak power. For cells that do not reach the maximum surface temperature after 5 minutes because they reach the lower voltage limit first, the measured power is multiplied by a correction factor that estimates the power that would have heated the cell to the maximum surface temperature within 5 minutes.<br> The thermal boundary condition is free convection. These operating conditions may be outside the cell manufacturer’s specification.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">continuous</span> 57.6 W<br> <span style="font-size: 10px">peak</span> 101 W</td> </tr> <tr> <td>Energy Density<br> <span class="collapseomatic noarrow" id="id699f65fb6df6d" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id699f65fb6df6d" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id699f65fb6df6d" class="collapseomatic_content collapsible_orange"> The energy densities result from the C/10 energy, the cell weight and the cell volume.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">gravimetric</span> 260 Wh/kg<br> <span style="font-size: 10px">volumetric</span> 742 Wh/l</td> </tr> <tr> <td>Power Density<br> <span class="collapseomatic noarrow" id="id699f65fb6dfb1" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id699f65fb6dfb1" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id699f65fb6dfb1" class="collapseomatic_content collapsible_orange"> The power densities result from the peak power, the cell weight and the cell volume.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">gravimetric</span> 1.42 kW/kg<br> <span style="font-size: 10px">volumetric</span> 4.07 kW/l</td> </tr> </tbody> </table>

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