Product Description
Experience the perfect balance of power and endurance with the 2Pcs Samsung 50S 21700 Battery (Model: INR21700-50S). Engineered to bridge the gap between high capacity and high discharge, this 21700 lithium-ion cell delivers an impressive 5000mAh capacity alongside a robust 25A continuous discharge (50A pulse). Whether you are building a high-performance e-bike battery pack, upgrading your power tools, or powering a tactical high-lumen flashlight, the Samsung 50S provides the energy density you need without sacrificing power output. This listing includes two individual cells (not pre-assembled), giving you the flexibility to build custom configurations in series or parallel for your specific project requirements. The 2-pack offers excellent value, providing enough cells for a small battery pack upgrade or replacement of worn-out cells in your existing devices.
Key Features
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High Capacity + High Drain (5000mAh + 25A): Offers the perfect balance. Enjoy 5000mAh of runtime with 25A continuous discharge, making it ideal for devices that need both long runtime and sustained power.
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Robust 25A Continuous Discharge: Delivers consistent, stable power under heavy loads without significant voltage sag or overheating. Supports up to 50A pulse discharge for short bursts of high demand.
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Massive 5000mAh Capacity: Provides 25% more capacity than standard high-drain cells (like the 40T), significantly extending your device's runtime between charges.
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Authentic Samsung Quality: Premium-grade INR21700-50S cells with excellent cycle life, safety certifications, and reliable voltage stability.
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Flat Top Design: Standard flat top configuration, compatible with most battery holders, spring-loaded contacts, and DIY battery pack builds.
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2-Piece Value Pack: Supplied as two individual cells, allowing you to replace worn-out cells in pairs, build a 1S2P (parallel), 2S1P (series), or other custom configurations to achieve your desired voltage and capacity.
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Versatile Performance: Suitable for both high-drain applications (power tools, e-bikes) and long-run applications (flashlights, portable stations).
Technical Parameters
Applications
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Electric Bikes (E-Bikes) / E-Scooters / E-Skateboards: Building high-performance battery packs that balance acceleration with long range. Two cells can serve as a starter pack or replacement for worn-out cells in an existing pack.
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Power Tools: Upgrading cordless drills, impact wrenches, angle grinders, and saws for both heavy-duty work and extended run time. Perfect for replacing old cells in a 2-cell tool battery.
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High-Power Flashlights: Powering high-lumen tactical flashlights, searchlights, and headlamps with sustained brightness. Many tactical flashlights use two 21700 cells in series for higher voltage.
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DIY Battery Packs: Creating custom 1S2P, 2S1P, or 2S2P battery banks for robotics, drones, or portable power stations.
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High-Performance RC Models: Suitable for 1/8th or 1/10th scale buggies/truggies and drones requiring high current spikes.
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Portable Power Stations: Building compact yet powerful battery banks for camping, emergency power, or off-grid applications.
FAQ
Q1: Does '2Pcs' mean it's a 2S battery pack assembled together?
A: No. "2Pcs" means you will receive two separate individual cells. You will need to assemble them in series, parallel, or a specific configuration based on your device's requirements.
Q2: What is the difference between Samsung 50S, 50E, and 40T?
A: The 50S is the balanced choice. It has the same 5000mAh capacity as the 50E but with a much higher 25A continuous discharge (vs 9.8A on 50E). Compared to the 40T, it has 1000mAh more capacity but slightly lower continuous discharge (25A vs 35A). Choose 50S if you need both long runtime and good power output.
Q3: Can I use these two cells to build a battery pack for my E-Bike?
A: A single 3.6V cell (or two cells) is not enough for an e-bike (which typically requires 36V, 48V, or 52V). Two cells can be combined in series to create a 7.2V pack, which is suitable for small devices like some flashlights or RC models. For an e-bike, you need many more cells wired in series. Always consult a professional if you are unsure.
Q4: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The Samsung 50S is an unprotected flat-top cell. It relies on the external device or a BMS (Battery Management System) to handle overcharge, over-discharge, and short-circuit protection.
Q5: What charger should I use?
A: Use a dedicated intelligent Li-Ion charger designed for 3.6V/4.2V cells. Ensure the charger supports the correct voltage for your specific pack setup (e.g., 1S charger for single cells, 2S charger for 2 cells in series, etc.).
Q6: How do I identify positive and negative terminals?
A: The flat top (the side with the Samsung logo and model number) is the Positive (+) terminal. The bottom (the side with the shiny metal casing and a slight indentation) is the Negative (-) terminal.
