Description
The Molicel INR-21700-P45B is a flagship high-power 21700 lithium-ion cell manufactured by Molicel (Taiwan), with a nominal capacity of 4500mAh and a maximum continuous discharge current of 45A (approximately 10C). As the next-generation upgrade to the P42A, it features a high-nickel ternary cathode and graphite/silicon additive anode, delivering an energy density of 242Wh/kg and a power density of 2314W/kg, achieving an exceptional balance between capacity and power output.
The P45B‘s core advantage lies in its low internal resistance—maximum DCIR is only 13.8mΩ, a 22% reduction compared to the P42A. This means lower voltage sag and less heat generation under high-current discharge, resulting in more stable actual output. It also supports up to 3C (13.5A) continuous fast charging, significantly reducing charging wait times.
In terms of cycle life, the P45B retains over 80% capacity after 500 cycles, and in eVTOL simulation testing achieved over 90% capacity retention after 3,270 cycles. In E-Formula racing environment comparison tests, the P45B showed 42.5% lower capacity fade and 48.8% lower internal resistance growth compared to the Samsung 40T, demonstrating exceptional high-power durability.
This product is available in five configurations: flat top, button top, spot welded tabs, pre-wired leads, and protected top. The 10-pack format supports applications ranging from DIY battery pack assembly to drop-in replacements. As a bare cell, the standard version requires a BMS-equipped system.
Key Features
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4500mAh High Capacity: Typical capacity of 4.5Ah (16.2Wh), a 7% capacity increase over the P42A while maintaining 45A discharge capability for longer runtime
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True 45A Continuous Discharge: Genuine continuous discharge current with maximum power output of 184W (10s, SOC 90%)
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Ultra-Low Internal Resistance: Maximum DCIR of only 13.8mΩ, 22% lower than P42A, minimizing voltage sag and maximizing efficiency under high current
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3C Fast Charging: Supports up to 13.5A continuous fast charge, significantly reducing charging time
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Outstanding Cycle Life: ≥80% capacity retention after 500+ cycles, far exceeding comparable competitors in high-power scenarios
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Five Configuration Options: Flat top, button top, spot welded tabs, pre-wired leads, and protected top for different assembly scenarios
Parameters
Applications
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E-Bikes and e-scooters: High power output and long range for acceleration and hill climbing
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Power tools: High-power cordless drills, angle grinders, saws, and professional-grade tool battery packs
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eVTOLs and drones: High power density for vertical take-off and landing instantaneous power demands
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Racing and high-performance vehicles: E-Formula racing battery packs and motorsport applications
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Vaping and high-drain portable devices: Stable high-current output
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DIY battery pack assembly: Welded tabs and pre-wired versions for spot welding and quick connections
FAQ
Q1: What is the capacity of the P45B?
A: Typical capacity is 4500mAh (16.2Wh), with a minimum capacity of 4300mAh—approximately a 7% increase over the P42A.
Q2: What is the maximum discharge current?
A: The maximum continuous discharge current is 45A (approximately 10C), achieved under 80°C temperature cut-off conditions. Maximum power output is 184W (10s, SOC 90%).
Q3: What are the main differences between P45B and P42A?
A: The P45B is the upgraded successor to the P42A: capacity increased from 4200mAh to 4500mAh (+7%), DCIR reduced from approximately 16mΩ to 13.8mΩ (-22%), and charging capability upgraded to 3C (13.5A) fast charge. The P45B delivers longer runtime and lower heat while maintaining 45A discharge.
Q4: What is the cycle life of this cell?
A: Under standard conditions, 500+ cycles with ≥80% capacity retention. In eVTOL simulated high-power cycling tests, over 90% capacity was retained after 3,270 cycles. In E-Formula racing environment comparisons, capacity fade was 42.5% lower than the Samsung 40T.
Q5: What are the differences between flat top, button top, welded tabs, pre-wired, and protected versions?
A: Flat top suits standard battery compartments or spot-welding assembly. Button top fits spring-loaded contacts. Welded tabs are for direct spot-welding into packs. Pre-wired leads suit quick replacement or solder-free applications. Protected versions include built-in overcharge/over-discharge/short-circuit protection, suitable for single-cell use without a BMS.
Q6: Does this cell have a protection circuit?
A: Standard, welded tab, and pre-wired versions are unprotected bare cells and must be used with a BMS or protected devices. The protected top version includes built-in protection circuitry, suitable for standalone single-cell use.
