Molicel INR21700-P50B

Molicel INR21700-P50B – Ultra-High Power 21700 Li-ion Cell

The Molicel INR21700-P50B is a next-generation 21700 lithium-ion cell engineered for applications that demand the highest possible combination of power, capacity, and cycle life in a single cell. It sets a new benchmark in the 21700 format with a superior power-to-energy ratio, making it one of the most capable cells available today for high-drain builds.

More Capacity, More Power, Longer Life

The P50B delivers a typical capacity of 5.0Ah at 18Wh — a meaningful step up from the previous P45B generation. What makes it stand out is not just raw capacity, but how it performs under load. A continuous discharge current of 60A, a peak discharge power of 397W at 25°C, and an impedance of just 12.8 mΩ mean that the P50B delivers power efficiently with minimal heat buildup — a critical advantage in tightly packed battery packs.

Cycle life is where the P50B makes its biggest leap. Under 100W discharge conditions, it achieves 1,400 cycles — double the 700 cycles of the P45B. For any application where battery replacement costs money and downtime, this improvement directly translates to lower total cost of ownership.

5C Fast Charging

The P50B supports a fast charge rate of 5C, enabled by its engineered graphite anode with silicon-carbon composite technology. This means a 5.0Ah cell can be recharged in roughly 12 minutes under optimal conditions — critical for commercial drone operations, racing applications, and any workflow where turnaround time matters.

Cold Weather Performance

Low-temperature operation is often a weakness of high-energy cells. The P50B addresses this with a dedicated low-temperature electrolyte formulation, delivering a peak discharge power of 238W at -10°C. This makes it viable for outdoor applications in cold climates where other cells lose significant capacity and power output.

What Makes It Different – Inside the Cell

• High-nickel layered oxide cathode — achieves 265 Wh/kg energy density
• High-wettability polymer separator — enables sustained 60A discharge
• Engineered graphite + silicon-carbon composite anode — supports 5C fast charge and doubles cycle life
• Advanced low-temperature electrolyte — maintains 238W peak power at -10°C
• Interface engineering — delivers ultra-low impedance of 12.8 mΩ

Common Applications

• FPV drones, cargo drones, heavy-lift drones, eVTOLs – high discharge current and doubled cycle life reduce pack replacement frequency on commercial operations
• Hyper EVs and racing sports cars – high energy density and 60A discharge handle peak acceleration loads
• Electric motorcycle racing – low impedance means consistent voltage under race conditions
• DIY Li-ion battery packs – ideal for 4S–6S high-drain packs used in robotics, UAVs, and electric vehicles
• Backup Battery Units (BBUs) – the P50B variant (P50S) is optimised for data center and telecom backup applications

Key Specifications

⚠️ This is an unprotected bare cell. Always use a proper BMS in your pack. Charge with a CC-CV lithium-ion charger with a 4.2V cutoff. Do not short circuit, puncture, or expose to temperatures outside the rated range.

P50B vs P42A – Which Should You Choose?

If your build prioritises maximum capacity and longest cycle life for sustained high-power use — such as long-range drones or commercial packs — the P50B is the upgrade. If you need a proven, widely available high-drain cell for freestyle FPV or standard DIY packs, the P42A remains a solid, cost-effective option.