Short Description
The Molicel P45B is the undisputed king of high-drain 21700 cells, delivering an unmatched combination of 4500mAh capacity and a blistering 45A continuous discharge (10C). This 2-pack is purpose-built for the most power-hungry devices: competition-level heavy-duty cordless tools, high-output 21700 flashlights, and high-performance RC models. With an astonishingly low internal resistance of approximately 8mΩ, the P45B virtually eliminates voltage sag under load, ensuring maximum power delivery from start to finish. The flat top design fits all standard spring-contact devices and is ideal for spot-welding into custom battery packs. When only the absolute best in power and capacity will do, the Molicel P45B is the professional’s choice.
Key Features
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Industry-Leading Performance – 4500mAh capacity paired with a true 45A continuous discharge (10C), delivering both extreme runtime and maximum power in a single cell.
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Ultra-Low Internal Resistance (~8mΩ) – Minimizes heat generation and voltage drop, keeping your device cooler and hitting harder under heavy loads.
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10C Discharge Rate – Engineered for applications demanding instant, sustained high current without compromise. The 45A rating provides ample headroom for most high-drain setups.
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Flat Top Design – Universally compatible with 21700 spring-contact battery holders, chargers, and flashlights. The flat positive terminal ensures clean, reliable spot-welding for pack builders.
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Excellent Capacity for High-Drain Use – At 4500mAh, it offers significantly longer runtime than 3000-4000mAh 21700 cells, while maintaining top-tier current delivery.
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2-Pack Convenience – Ideal for dual-battery regulated mods, single-cell mechanical tubes, or as the foundation for building a high-performance RC or tool pack.
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Molicel Genuine Quality – Manufactured by Molicel, a trusted brand known for rigorous quality control and consistent, reliable cells used by professionals worldwide.
Parameters
Applications
Recommended For
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High-Power Vaping: Mechanical mods, unregulated boxes, and high-wattage regulated mods. Safely supports sub-ohm builds drawing up to 45A continuous, with minimal sag for consistent performance.
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Cordless Power Tools: Impact drivers, drills, circular saws, and high-torque wrenches. Perfect for rebuilding tool battery packs where both runtime and instantaneous power matter.
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High-Output 21700 Flashlights: FET-driven or multi-emitter hot-rod lights that demand sustained 30-40A draws. The 4500mAh capacity ensures long turbo runtimes.
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RC Cars, Boats & Drones: Competitive-level models requiring extreme burst currents and longer play sessions.
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High-Performance E-Bike & E-Scooter Packs: Where per-cell current draws approach 45A; the high capacity reduces the number of parallel cells needed.
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Portable Spot Welders & High-Power DIY Projects: Any application where massive pulse currents and reliable energy storage are essential.
Not Recommended For
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Low-Power Long-Runtime Devices: Solar lights, sensors, or clocks. The high-rate capability is wasted; choose a 5000mAh 10A 21700 for better economy.
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18650-Only Devices: This is a 21700 cell (21mm x 70mm) and will not fit in 18650 compartments.
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Standard USB Power Banks: The P45B’s performance far exceeds what a 5V/2A power bank requires; use a high-capacity, lower-cost cell instead.
FAQ
Q: What does the 10C rating mean, and how does it relate to 45A?
A: The “C” rating is a multiplier of the cell’s capacity expressed in amperes. The P45B has a capacity of 4500mAh (4.5Ah). 10C means 4.5Ah × 10 = 45A continuous discharge. This indicates the cell can safely deliver 45A of continuous current without overheating or excessive voltage drop.
Q: Can I use this battery in my 18650 device?
A: No. The P45B is a 21700 cell, which has a larger diameter (21mm) and longer length (70mm) than an 18650 (18mm × 65mm). It will not fit unless your device explicitly supports 21700 batteries. Always verify your device’s specifications before purchasing.
Q: Is this a protected battery?
A: No, the Molicel P45B is an unprotected flat top cell, which is standard for high-drain applications. This allows unrestricted current flow. For single-cell use, your device must have its own built-in protections. For multi-cell packs, you must use an external BMS rated for at least 60A.
Q: Can I solder wires directly onto the battery terminals?
A: Never solder directly onto lithium-ion cells. The intense heat can damage the internal separator and safety mechanisms, leading to permanent damage or a dangerous failure. Always use a spot welder to attach nickel strips. For wire connections, use nickel tabs with pre-soldered leads that are spot-welded to the cell.
Q: How should I store these cells when not in use?
A: Store at a nominal voltage of 3.6–3.7V per cell (approximately 40-50% state of charge). Keep them in a cool, dry place and use non-conductive battery cases to prevent accidental short circuits. Avoid storing them fully charged or deeply discharged for extended periods.
Q: Why choose the P45B over other 21700 high-drain cells?
A: The P45B offers the best balance of extreme current (45A) and high capacity (4500mAh). Competing cells like the Samsung 40T (4000mAh/35A) or BAK 45D (4500mAh/45A) are excellent, but the P45B’s ultra-low 8mΩ internal resistance gives it an edge in voltage stability and heat management under sustained heavy loads.
