Description
Experience the ultimate in 18650 convenience and capacity with the Vapcell P1840A, featuring a massive 4000mAh capacity and a built-in USB-C charging port. This 2-pack is the pinnacle of all-in-one power solutions—no dedicated charger needed, just plug any USB-C cable directly into the battery to recharge from a wall adapter, power bank, car charger, or laptop. Built around a premium ultra-high-capacity cell core, it delivers industry-leading runtime for LED flashlights, headlamps, smart doorbells, and portable fans. Integrated overcharge, over-discharge, and short-circuit protection ensures safe, worry-free operation, while the button top design guarantees reliable contact in Fenix, Streamlight, and most other major flashlight brands. The modern USB-C port offers reversible plugging and faster charging. For users who refuse to compromise on either capacity or convenience, the P1840A is the definitive choice.
Key Features
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Built-in USB-C Charging Port – Recharge directly from any standard USB-C power source. No external 18650 charger required. USB-C offers reversible plugging and improved durability over older Micro-USB designs. The built-in LED glows red while charging and turns green when fully charged.
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4000mAh Maximum 18650 Capacity – Powered by a premium ultra-high-capacity cell core, delivering the highest capacity available in a mass-produced USB-C rechargeable 18650. Provides approximately 14% more runtime than 3500mAh cells and about 60% more than 2500mAh cells.
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Integrated Safety Protection – Built-in circuit guards against overcharge (4.2V), over-discharge (2.5V), short circuit, and overcurrent (10A limit), ensuring safe and reliable operation in any compatible device.
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Button Top Design – Raised positive terminal ensures reliable electrical contact in Fenix, Streamlight, and most other 18650 flashlights and devices requiring a button top.
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LED Charging Indicator – Convenient built-in LED shows charging status at a glance: red means charging, green means fully charged and ready to use.
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2-Pack Convenience – Perfect for keeping a spare always ready. Power your flashlight and headlamp, or your doorbell and fan, with matching maximum-capacity cells.
Parameters
Applications
Recommended For
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LED Flashlights & Tactical Torches: Perfect for Fenix, Streamlight, and most other brands requiring a button top 18650. The 4000mAh capacity provides the longest possible runtime in a USB-C rechargeable 18650—ideal for extended trips, professional inspection, and emergency preparedness.
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Headlamps for Outdoor & Professional Use: Ideal for camping, running, caving, and industrial work. The protection circuit prevents over-discharge damage, and USB-C enables easy field recharging from a power bank or car charger.
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Smart Doorbells & Wireless Security Cameras: Many video doorbells use 18650 cells. The P1840A provides maximum runtime between charges, and the USB-C port allows easy periodic recharging without removing the battery from the mounting bracket.
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Camping Lanterns & Emergency Lights: Any USB-C power source becomes your charger. The 4000mAh capacity ensures lights stay on through the longest power outages.
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Portable Fans & Travel Gadgets: Minimize accessories—no separate charger to carry in your travel kit. One USB-C cable charges your phone, tablet, and spare batteries.
Not Recommended For
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High-Power Vaping / Mechanical Mods: These require 15–35A unprotected cells. The 10A protection limit is insufficient for sub-ohm applications and will cut off power under heavy load.
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Cordless Power Tools: Drills, saws, and impact drivers demand 20–40A continuous current, far beyond this battery's 10A protection limit.
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RC Cars, Drones & High-Drain Models: These require 20–30A+ continuous current. This battery will not function and may trigger protection.
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Ultra-Compact Flashlights with Tight Battery Tubes: This battery measures approximately 71mm in length due to the USB-C port and protection circuit. Some ultra-compact flashlights may not close fully. Always verify your device can accommodate the extra length.
FAQ
Q: How do I charge this battery?
A: Simply connect a standard USB-C cable to the charging port on the battery and plug the other end into any USB power source—a phone charger, power bank, laptop, or car adapter. The built-in LED glows red during charging and turns green when fully charged. A full charge takes approximately 5–6 hours depending on the power source.
Q: Will this fit my flashlight?
A: It fits most flashlights that accept button top 18650 cells. Due to the integrated USB-C charging port and protection circuit, this battery is approximately 71mm long—about 6mm longer than a standard unprotected 18650 (65mm). Most flashlights with spring-loaded contacts can accommodate this, but some ultra-compact models may not close completely. Please measure your device's battery tube before ordering.
Q: Can I also charge this battery in a regular 18650 charger?
A: Yes. The P1840A can be charged either through its built-in USB-C port or in any standard 18650 Li-ion charger that accepts button top cells. Both methods are safe and fully supported.
Q: Is this battery suitable for vaping or power tools?
A: No. Vaping devices and power tools require high continuous currents (typically 15–40A). The P1840A's protection circuit limits output to approximately 10A. Using it in such devices will cause the protection to cut off or may damage the battery. For these applications, use dedicated high-drain unprotected cells such as the Vapcell T28 (25A) or K30 (30A).
Q: How much more runtime does 4000mAh give compared to 3500mAh?
A: The P1840A provides approximately 14% more runtime than a 3500mAh cell. In practical terms, a flashlight that runs for 5 hours on high with a 3500mAh cell could run for nearly 6 hours with the P1840A. Combined with USB-C convenience, it is the ultimate upgrade for runtime-critical devices.
Q: How should I store these cells long-term?
A: Store at approximately 3.6–3.7V (40–50% charge) in a cool, dry place using a non-conductive battery case. Avoid storing fully charged or fully discharged for extended periods. The USB-C port makes it easy to top up before use after storage.
