25A continuous rating
Supports demanding professionally designed packs while preserving a 5Ah-class capacity.
Samsung INR21700-50S 5000mAh 21700 Battery (High Drain)
$6.99 USD
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Samsung INR21700-50S 5000mAh 21700 Battery (High Drain)
$6.99 USD
Samsung SDI high-power 21700 cell
High power without giving up runtime.
The Samsung INR21700-50S combines 5,000mAh typical capacity with a manufacturer-rated 25A maximum continuous discharge current. It is a strong platform for professionally engineered e-bike, mobility, power-tool, robotics and custom battery packs that need both energy and current capability.
5,000mAh typical
25A max continuous
3.6V nominal
Flat top, unprotected
ULS performance tested
Watch our 50S and 35E comparison
Bulk quantities
Builder, dealer and OEM support
Custom-ready
Tabs, connectors, rings and packs
Las Vegas support
Talk with a U.S.-based battery team
Why builders choose the Samsung 50S
The 50S occupies a useful middle ground: 21700-class capacity for range, plus substantially more current capability than a range-focused energy cell such as the Samsung 35E.
Low initial impedance
Samsung specifies initial AC impedance of 14mΩ or less under its stated test conditions.
More than loose cells
ULS can support tabs, insulation, wiring, connectors, BMS integration and complete pack builds.
Watch the Samsung 50S performance test
See United Lithium Solutions compare the Samsung 50S and Samsung 35E for a practical look at the tradeoff between higher-power performance and range-focused capacity.
Test results apply to the demonstrated samples and conditions. Actual performance varies with pack design, load, temperature, age and test method.
Turn the 50S into a project-ready solution
Tell us your pack voltage, capacity, continuous and peak current, dimensions, connector and production quantity. Our Las Vegas team can supply cells and the supporting components—or quote a complete custom battery pack.
Custom battery tabs
Interconnect patterns and material options for your pack layout.
Battery connectors
Connector, cable and harness support based on your application.
Insulator rings
Positive-terminal rings and additional electrical insulation components.
Custom battery packs
21700 pack design and assembly for qualified commercial projects.
BMS integration
Protection strategy and BMS options matched to the intended pack design.
Commercial supply
Volume support for builders, dealers, repair centers and OEM programs.
Samsung INR21700-50S specifications
Core values are based on Samsung SDI INR21700-50S Product Specification Version 0.2. Commercial qualification should confirm the applicable model, revision, lot and pack-level operating limits.
| Manufacturer / model | Samsung SDI / INR21700-50S |
|---|---|
| Cell format | 21700 cylindrical lithium-ion cell |
| Standard discharge capacity | 5,000mAh typical under manufacturer test conditions |
| Rated discharge capacity | 4,800mAh minimum under manufacturer test conditions |
| Nominal voltage | 3.60V |
| Charge voltage | 4.20V |
| Standard charge | CCCV, 2.50A, 250mA cut-off |
| Rated / max continuous charge | CCCV, 6.00A, 100mA cut-off |
| Maximum step-charge current | 10.00A; requires a properly controlled step-charge profile |
| Maximum continuous discharge | 25.00A without a temperature cut-off |
| Temperature-controlled high-rate condition | 45.00A with an 80°C cell-surface cut-off and specified re-discharge conditions |
| Discharge cut-off voltage | 2.50V |
| Initial AC impedance | 14mΩ maximum at 1kHz after rated charge |
| Ambient operating temperature | Charge: 0 to 60°C; discharge: -20 to 60°C |
| Maximum dimensions | 21.25mm diameter × 70.62mm height |
| Maximum cell weight | 72.0g |
| Terminal / protection | Flat top / unprotected industrial cell |
Important current-rating distinction: 25A is Samsung's maximum continuous-discharge value without a temperature cut-off. The 45A condition requires an 80°C cell-surface temperature cut-off and controlled re-discharge behavior. It should not be advertised as an unrestricted 45A rating.
Pack designers are responsible for protection, cell spacing, fusing, BMS settings and thermal management. Ratings do not guarantee identical behavior in every finished pack.
Is the 50S right for your build?
Strong fit for
- High-performance e-bike and light electric-mobility packs
- Power tools, robotics and industrial battery assemblies
- Projects that need a balance of runtime and continuous-current capability
- Qualified pack builders and commercial/OEM battery programs
Review the design when
- The design depends on the 45A temperature-controlled operating condition
- The pack cannot monitor cell temperature or manage heat and current safely
- Maximum energy density matters more than power capability
- The cell would be used loose, without proper protection or in a vape device
Technical documents
Request the document set for the exact Samsung 50S model and inventory lot being quoted. Public document links should be added only after publication rights and model/lot applicability are confirmed.
Important lithium-ion cell safety
This is an unprotected industrial cell, not a finished consumer battery.
Use only in a professionally engineered battery pack with a compatible BMS or protection circuit, current protection, adequate insulation and thermal management. Never carry or store loose cells where metal objects can short the terminals. Do not use a cell with a damaged wrap, dent, leak, corrosion or abnormal heat. Do not exceed manufacturer ratings. Not for vaping or e-cigarette devices.
Need cells, components or a complete pack?
Send your quantity, pack voltage, capacity, maximum continuous current, peak current, dimensions and connector requirements. United Lithium Solutions will review the project and recommend the right supply or build option.