Product Description
Unleash high-power performance with the DMEGC 40P 21700 Battery 2Pcs (Model: 21700-40P). Engineered by DMEGC (Dongyang Magnetic Materials), a leading Chinese lithium-ion cell manufacturer, these 21700 batteries deliver a solid 4000mAh capacity combined with an impressive 30A continuous discharge (up to 60A pulse). Designed for high-drain applications, the DMEGC 40P is the perfect choice for power tools, high-performance e-bikes, drones, and other demanding devices that require explosive current output without compromising reliability. This listing includes two individual cells (not pre-assembled), giving you the flexibility to build custom battery packs in series or parallel configurations for your specific high-power projects.
Key Features
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High 30A Continuous Discharge: Built for high-power demands. Delivers a massive 30A continuous current output under heavy loads, making it ideal for the most power-hungry devices. Supports up to 60A pulse discharge for short bursts of maximum power.
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Solid 4000mAh Capacity: Offers a healthy 4000mAh capacity while maintaining its incredible high-drain capability, providing a practical balance between runtime and raw power output.
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Ultra-Low Internal Resistance: Engineered for minimal energy loss during high-current discharge, generating less heat and ensuring maximum power delivery to your device.
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Authentic DMEGC Quality: Premium-grade 21700-40P cells from a reputable manufacturer, ensuring excellent cycle life, safety certifications, and consistent voltage stability under extreme loads.
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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-Pack Value: Supplied as two individual cells, allowing you to build a 2S series pack (7.2V), a 1S2P parallel pack (8000mAh), or replace worn-out cells in pairs for balanced high-power performance.
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High-Power Specialized: Specifically optimized for high-drain devices like power tools, high-performance e-bikes, drones, and advanced electronic mods, where standard cells would struggle.
Technical Parameters
Applications
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High-Performance Power Tools: Upgrading cordless drills, impact wrenches, angle grinders, and chainsaws to handle the toughest jobs without bogging down. Two cells can power smaller tools or be used in a larger pack.
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Heavy-Duty Electric Bikes (E-Bikes): Building or upgrading battery packs for high-torque motors, steep terrain riding, and demanding off-road e-bike applications. Two cells are a great start for a custom pack.
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High-Performance RC Models & Drones: Powering 1/8th or 1/10th scale buggies/truggies, large drones, and other RC vehicles requiring brutal current spikes.
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High-Drain Tactical Flashlights: Fueling high-lumen searchlights and tactical flashlights that demand massive current for ultra-bright output. Many tactical lights use two 21700 cells.
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Custom DIY Battery Packs: Building 2S, 3S, 4S, or larger high-power packs for robotics, e-skateboards, or portable heavy-duty tools.
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 (for 7.2V), parallel (for 8000mAh), or a specific configuration based on your device's requirements.
Q2: How does DMEGC 40P compare to Samsung 40T?
A: The DMEGC 40P offers very similar performance to the Samsung 40T. Both have 4000mAh capacity and 30A+ continuous discharge. The DMEGC 40P is generally more affordable, making it an excellent cost-effective alternative for users who want high-power performance without the premium price tag.
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, suitable for small devices like some flashlights or RC models. For an e-bike, you need many more cells wired in series. The DMEGC 40P is an excellent choice for high-performance e-bike packs due to its 30A discharge. Always consult a professional if you are unsure about building a pack.
Q4: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The DMEGC 40P 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 DMEGC 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.
Q7: Is DMEGC a reliable brand?
A: Yes. DMEGC (Dongyang Magnetic Materials) is a well-established Chinese manufacturer with significant experience in lithium-ion cell production. While not as globally recognized as Samsung or LG, their cells offer solid performance, good safety standards, and excellent value for money.
