Key Features
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30A Continuous High Drain – Sustains high current output for demanding devices without overheating or significant voltage drop.
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5000mAh Genuine Capacity – Provides extended runtime, ideal for long-lasting flashlights, emergency lights, and portable power needs.
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Flat Top Design – Low-resistance contact surface ensures compatibility with a wide range of 21700 hosts, from flashlights to battery packs.
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Ultra-Low Internal Resistance (≈12–15mΩ) – Maximizes efficiency, reduces waste heat, and maintains stable voltage under heavy loads.
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High Capacity + High Drain Combined – No need to choose between endurance and power; one cell covers both low-drain long-run and high-drain burst applications.
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10-Pack Bulk Value – Economical multi-pack for powering multiple devices, building DIY battery packs, or keeping a full rotation of spares.
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A-Grade Cells – Every battery is inspected, tested, and capacity-matched to ensure consistent performance and safety.
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Long Cycle Life – ≥500 charge-discharge cycles while retaining over 70% of original capacity, reducing total ownership cost.
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Built-in Safety Features – Pressure relief vent and current interrupt device (CID) provide critical protection under fault conditions.
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Versatile Use – Perfect for flashlights, headlamps, emergency lights, portable fans, and many other electronics.
Parameters
Applications
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High-Lumen Flashlights & Tactical Torches – Drives turbo modes up to 30A with minimal sag, perfect for search, rescue, and EDC lights.
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Emergency Lights & Camping Lanterns – 5000mAh ensures all-night illumination during power outages or outdoor trips.
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Headlamps & Helmet Lights – Combines high brightness and long runtime for caving, cycling, and professional use.
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Portable Electronics & DIY Projects – Ideal for powering USB chargers, portable fans, Bluetooth speakers, smart door locks, and sensor nodes.
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DIY Battery Packs – Perfect for rebuilding cordless tool packs, small e-bike batteries, or solar power banks where both capacity and current matter.
FAQ
Q1: Do these batteries have a protection circuit?
A: No. They are unprotected flat-top cells, designed to offer the lowest possible internal resistance for high-drain applications. Always use them in devices with built-in over-discharge and over-current protection, or install an external protection PCB. Never short circuit.
Q2: Is the capacity really 5000mAh?
A: Yes. Capacity is verified by 0.2C standard discharge. Under high current (e.g., 20A), usable capacity may be around 4700–4900mAh due to internal resistance losses, which is normal.
Q3: Will they fit my LED flashlight?
A: If your flashlight accepts unprotected flat-top 21700 cells, yes. Verify that the positive contact can reach a flat terminal. Some flashlights designed only for button-top cells may require a magnet spacer (use with extreme care and at your own risk).
Q4: What charger do I need
A: A dedicated Li-ion charger that supports 3.6V/3.7V cells, 21700 size, with CC/CV profile and 4.2V cutoff. Recommended brands: Xtar, Nitecore, Vapcell, or Gyrfalcon. Never use NiMH chargers.
Q5: Can I mix these with old batteries in a multi-cell device?
A: Absolutely not. Always use identical cells of the same model, age, and charge status when running in series or parallel. Mixing mismatched cells can cause imbalance, overheating, or even fire.
Q6: How should I store these batteries?
A: Store at 3.6–3.7V (around 40–60% charge) in a cool, dry place. Avoid high temperatures. Check voltage every 3 months and recharge to storage voltage if needed.
Q7: Are the 10 cells in the pack matched?
A: Yes. The 10-pack consists of A-grade cells that are capacity-matched and internal-resistance-checked, making them suitable for use as a set in multi-cell applications.
