Unlock the Full Potential of Your High-Drain Devices
Unlock the full potential of your high-drain devices with our 2Pack Samsung 40T 21700 Cells (Model: INR21700-40T). Renowned for its legendary performance in the DIY and power tool community, this 21700 battery delivers a massive 4000mAh capacity while supporting a blistering 35A continuous discharge. Whether you are upgrading your electric bike (E-Bike), building a high-capacity battery pack for power tools, or powering heavy-duty robotics, the Samsung 40T provides consistent, reliable, and safer energy delivery. This listing includes two individual cells (not soldered or pre-assembled), offering you the flexibility to build your own packs or replace worn-out batteries in high-performance devices.
Key Features
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High Discharge Rate (35A Continuous)
Designed for high-power applications. It can handle sudden surges in current demand without overheating or voltage sag, perfect for performance-driven devices.
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High Capacity (4000mAh)
Provides longer runtime between charges compared to standard 21700 cells, keeping your tools and rides running longer.
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Trusted Samsung Quality
Premium-grade INR21700-40T cells. Authentic Samsung manufacturing ensures safety, lifespan, and stable voltage output.
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Flat Top Design
Standard flat top configuration for easy DIY assembly and compatibility with most battery holders and spring-loaded devices.
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2-Pack Value
Supplied as two individual cells, providing flexibility for series or parallel configurations to achieve the voltage or capacity your project requires.
Technical Parameters
Applications
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Electric Bikes (E-Bikes) / Scooters / Skateboards
Building or replacing battery packs for high-speed electric rides.
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Power Tools
Retrofitting cordless drills, impact wrenches, angle grinders, and hedge trimmers.
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High-Drain Flashlights
Powering tactical searchlights and high-lumen flashlights.
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DIY Battery Packs
Creating custom 2S, 3S, 4S, or larger 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.
FAQ
Q1: Does "2Pack" mean it's a 2S battery pack assembled together?
A: No. "2Pack" 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: Can I use these batteries directly in my E-Bike?
A: Usually, a single 3.6V cell is not enough for an E-Bike (which typically requires 36V, 48V, or 52V). You need to build a battery pack using multiple cells wired in series. For a 48V E-Bike, you typically need 13 cells in series (13S). Always consult with a professional if you are unsure about building a battery pack.
Q3: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The Samsung 40T is an unprotected flat-top cell. It relies on the external device or the BMS (Battery Management System) of the pack you build to handle overcharge, over-discharge, and short-circuit protection.
Q4: 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).
Q5: How do I identify positive and negative terminals?
A: The flat top (the side with the Samsung logo and model number on it) is the Positive (+) terminal. The bottom (the side with the shiny metal casing and a slight indentation) is the Negative (-) terminal.
