Short Description
Power your high-demand devices with the Sunpower 21700 5000mAh 30A flat top battery. Engineered for sustained high-current output, this 10-pack delivers a massive 5000mAh capacity and a true 30A continuous discharge (6C). It is the ultimate power solution for e-bike battery packs, cordless power tools, high-output 21700 flashlights, RC models, and DIY energy storage projects. The flat top design ensures universal compatibility with spring-loaded contacts and makes spot-welding nickel strips clean and reliable. With low internal resistance and excellent cycle life, these cells provide consistent, long-lasting power when you need it most.
Key Features
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5000mAh Ultra-High Capacity – One of the highest capacity cells in the high-drain category, significantly extending runtime for power-hungry devices.
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30A Continuous Discharge (6C) – Delivers stable, high current output for electric motors, high-power LEDs, and inverters with minimal voltage sag.
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Flat Top Design – Fits all standard 21700 battery holders, spring-contact chargers, and flashlights; flat positive terminal is ideal for spot-welding into custom packs.
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Excellent Cycle Life – Retains ≥70% capacity after 500 standard charge/discharge cycles, reducing long-term replacement costs.
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Low Internal Resistance (≤15mΩ) – Minimizes energy loss as heat, keeps your device running cooler, and maximizes power delivery under load.
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10-Pack Bulk Value – Perfect quantity for building a 36V e-bike pack, rebuilding tool battery packs, or stocking up for multiple high-drain devices.
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Wide Application Range – Suitable for e-bikes, electric scooters, cordless drills, LED flashlights, RC cars, portable power stations, and more.
Parameters
Applications
Recommended For
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E-Bike & E-Scooter Battery Packs: The 30A continuous discharge supports most 250W–750W motors, and 5000mAh capacity reduces the number of parallel cells needed in a pack. Always use a properly rated BMS.
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Cordless Power Tools: Impact drivers, drills, circular saws, and high-torque wrenches. Ideal for rebuilding tool battery packs with longer runtime.
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High-Output 21700 Flashlights: FET-driven or multi-emitter torches requiring sustained current up to 25A for maximum brightness; the large capacity enables extended high-mode runtime.
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RC Cars, Boats & Airplanes: Provides strong burst power and significantly longer play sessions compared to lower-capacity high-drain cells.
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DIY Portable Power Stations: Build high-capacity DC power banks or AC inverters for camping, fieldwork, or emergency backup.
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Garden Tools & Robotics: Any 21700-compatible high-drain application where both runtime and current matter.
Not Recommended For
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Extreme High-Drain Applications (continuous >40A): Choose 40A–45A rated 21700 cells (e.g., BAK 45D, Samsung 40T) if your device demands sustained current beyond 30A.
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Low-Power, Ultra-Long-Runtime Devices: For solar lights, sensors, or clocks, use a high-capacity low-drain cell (e.g., 5000mAh 10A 21700) to save cost.
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18650-Only Devices: The 21700 format is physically larger; verify your device’s battery compartment before ordering.
FAQ
Q: What does 6C mean, and how is it related to 30A?
A: “C” rating is the discharge current as a multiple of the cell’s capacity. Since this cell has a capacity of 5000mAh (5Ah), 6C equals 5Ah × 6 = 30A continuous discharge. It indicates the cell can safely deliver 30A without excessive heat or voltage sag.
Q: Can I use this battery in my 18650 device?
A: No. This is a 21700 cell (21mm diameter, 70mm length), which is thicker and longer than an 18650 (18mm × 65mm). It will not fit unless your device specifically supports 21700 cells. Always check your device’s specifications.
Q: Is this a protected battery?
A: No, it is an unprotected flat top cell. This is standard for high-drain cells to allow unrestricted current flow. For multi-cell packs, you must install a BMS rated for at least 40A. For single-cell use, ensure your device has built-in protection.
Q: How many cells do I need for a 36V e-bike battery?
A: A typical 36V e-bike pack uses a 10S configuration (10 cells in series). This 10-pack provides exactly the number of cells needed for one series string. Depending on your capacity requirements, you may need additional parallel strings (e.g., 10S2P requires 20 cells). Always use matched cells and a suitable BMS.
Q: Can I solder wires directly to the battery?
A: Never solder directly onto lithium-ion cells. The extreme heat can damage internal components and lead to failure or safety hazards. Use a spot welder to attach nickel strips. For wire connections, spot-weld nickel tabs with pre-attached leads.
Q: How should I store these batteries long-term?
A: Store at 3.6–3.7V per cell (approximately 40-50% state of charge) in a cool, dry place. Use non-conductive storage cases to prevent accidental short circuits. Avoid storing fully charged or deeply discharged for extended periods.
