Samsung INR21700-45T

Samsung Battery Cell

In brief: 21700 Li-ion battery cell. 4500mAh capacity. 35A continuous discharge.

Specs verified Oct 15, 2026

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Current best price $6.99. Over the past 90 days: low $4.35, high $6.99, average $6.83 — up 2% vs average.

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Specifications

Cell Specs

Form Factor: 21700
Chemistry: Li-ion
Capacity: 4500mAh
Continuous Discharge: 35.00A

Physical

Weight: 70 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 INR21700-45T: 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">sourced by Batemo</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 70.5 mm</td> </tr> <tr> <td>Weight</td> <td style="text-align:right">70.1 g</td> </tr> <tr> <td>Capacity<br> <span class="collapseomatic noarrow" id="id69ba1403ef846" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id69ba1403ef846" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id69ba1403ef846" 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 0.45A (0.1C) until reaching the voltage of 2.5V. The thermal boundary condition is free convection.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">nominal</span> 4.5 Ah<br> <span style="font-size: 10px">C/10</span> 4.41 Ah</td> </tr> <tr> <td>Current<br> <span class="collapseomatic noarrow" id="id69ba1403ef8c4" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id69ba1403ef8c4" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id69ba1403ef8c4" 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 2.5V 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 2.5V 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> 22.8 A<br> <span style="font-size: 10px">peak</span> 35.1 A</td> </tr> <tr> <td>Energy<br> <span class="collapseomatic noarrow" id="id69ba1403ef915" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id69ba1403ef915" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id69ba1403ef915" 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 0.45A (0.1C) until reaching the voltage of 2.5V. The thermal boundary condition is free convection.<br> </div></td> <td style="text-align:right"> <span style="font-size: 10px">C/10</span> 16.1 Wh</td> </tr> <tr> <td>Power<br> <span class="collapseomatic noarrow" id="id69ba1403ef95f" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id69ba1403ef95f" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id69ba1403ef95f" 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 2.5V 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 2.5V 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> 77.7 W<br> <span style="font-size: 10px">peak</span> 122 W</td> </tr> <tr> <td>Energy Density<br> <span class="collapseomatic noarrow" id="id69ba1403ef9b2" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id69ba1403ef9b2" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id69ba1403ef9b2" 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> 230 Wh/kg<br> <span style="font-size: 10px">volumetric</span> 655 Wh/l</td> </tr> <tr> <td>Power Density<br> <span class="collapseomatic noarrow" id="id69ba1403ef9f8" tabindex="0" alt="definition" title="definition">definition</span><span id="swap-id69ba1403ef9f8" alt="'close'" class="colomat-swap" style="display:none;">close</span><div id="target-id69ba1403ef9f8" 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> 1.74 kW/kg<br> <span style="font-size: 10px">volumetric</span> 4.94 kW/l</td> </tr> </tbody> </table>

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