Description
Get the best of both worlds with the Vapcell F45, a versatile 21700 cell that strikes the ideal balance between high capacity and usable current. This 2-pack delivers a solid 4500mAh capacity and a capable 20A continuous discharge, making it the go-to choice for users who need more runtime than pure high-drain cells but more power than standard high-capacity cells. It excels in high-output LED flashlights, light-to-medium cordless power tools, e-bike range extender packs, and regulated The flat top design ensures universal compatibility with spring-loaded contacts and simplifies spot-welding for custom battery packs. With approximately 12.5% more capacity than 4000mAh cells and 50% more current headroom than typical 10A high-capacity cells, the F45 is the all-purpose performer for your demanding devices.
Key Features
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4500mAh / 20A Balanced Performance – Combines a substantial 4500mAh capacity with a true 20A continuous discharge. Delivers significantly more runtime than 4000mAh high-drain cells while providing ample current for turbo flashlight modes, power tools, and moderate e-bike loads.
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20A Continuous Discharge (CDR) – Stable, reliable power output that handles FET-driven turbo modes, impact driver surges, and sub-ohm vaping builds (down to ~0.18Ω safely). Far more capable than 10A-limited high-capacity cells.
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Flat Top Design – Universally compatible with all standard 21700 spring-contact chargers, flashlights, and battery trays. The flat terminal is ideal for spot-welding nickel strips in custom battery packs.
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Long Cycle Life – Retains over 80% of initial capacity after 500 charge/discharge cycles under recommended conditions, reducing long-term replacement costs.
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2-Pack Convenience – Perfect for powering a flashlight and a tool, building a compact e-bike pack, or keeping a spare ready for your high-drain device.
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Vapcell Quality Control – Each cell is tested and matched for consistent capacity and low internal resistance, ensuring reliable performance across the pack.
Parameters
Applications
Recommended For
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High-Output 21700 LED Flashlights: The 20A CDR comfortably handles FET-driven turbo modes while the 4500mAh capacity provides noticeably longer runtime than 4000mAh cells. Ideal for search and rescue, professional inspection, and outdoor enthusiasts.
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Light-to-Medium Cordless Power Tools: Impact drivers, drills, and wrenches benefit from the 20A surge capability and extended runtime. Perfect for rebuilding tool battery packs when used with matched cells and a proper BMS.
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E-Bike Range Extender Packs: In multi-parallel configurations, the 20A per cell supports 250W–500W motors, while the 4500mAh capacity delivers solid range. Always use a properly rated BMS.
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RC Cars, Boats & DIY High-Drain Projects: Instantaneous burst capability with the endurance of 4500mAh capacity for longer play or work sessions.
Not Recommended For
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Extreme Competition Vaping / Super-Sub-Ohm Builds (>20A Continuous): Requires 25–35A CDR. Choose the Vapcell T42 (35A) or K40 (30A) for builds below 0.15Ω.
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Heavy-Duty Power Tools (Angle Grinders, Rotary Hammers): These demand 30–40A continuous current. Use Vapcell T42 or dedicated ultra-high-drain cells.
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Ultra-Long Runtime Low-Power Devices (<5A): A 5000–6000mAh high-capacity cell like the Vapcell F60 or F50 will provide longer runtime for solar lights, sensors, and USB power banks.
FAQ
Q: How does the F45 compare to the Vapcell T42 or K40?
A: The F45 prioritizes capacity (4500mAh) with a solid 20A CDR—ideal for users who need more runtime and are willing to trade some peak current. The T42 (4200mAh/35A) and K40 (4000mAh/30A) prioritize maximum current for extreme applications. Choose the F45 if your device draws 15–20A and you want longer runtime; choose the T42 or K40 if you need 30A+ for competition vaping or heavy power tools.
Q: Can I use this battery for vaping? What resistance is safe?
A: Yes, for regulated mods and mechanical mods with builds drawing up to 20A continuous. At 3.6V nominal, this safely supports builds down to approximately 0.18Ω, leaving a comfortable margin. Always calculate your actual current using Ohm's law and never exceed 20A continuous.
Q: Can I build an e-bike battery with these?
A: Yes, but only in a multi-parallel configuration. A single F45 cannot provide enough current for most e-bike motors. Use at least a 3P or 4P configuration so each cell stays within the 20A limit. Always use matched cells, spot-welded nickel strips, and a properly rated BMS.
Q: Is this a high-drain or high-capacity cell?
A: It is a balanced cell that sits between the two categories. The F45 offers 12.5% more capacity than typical 4000mAh high-drain cells, and 100% more current capability than typical 10A high-capacity cells. It is designed for users who need both decent runtime and strong current delivery.
Q: How should I store these cells when not in use?
A: Store at 3.6–3.7V (approximately 40–50% charge) in a cool, dry place. Use non-conductive battery cases to prevent accidental short circuits. Avoid storing fully charged or deeply discharged for extended periods.
