Molicel P42A 4200mAh – 45A

P42A (21700) is a high-current 4200 mAh Li-ion INR cell designed for high-power battery packs where high energy density and high discharge current are required. Ideal for e-bikes, e-scooters, e-motorcycles and other projects using 3.6 V nominal voltage with BMS.

Specifications

• Format: 21700 (unprotected cell)
• Capacity (typical): 4200 mAh
• Nominal (“standing”) voltage: 3.6 V
• Max. charging voltage: 4.20 V
• Min. discharge voltage (cut-off): 2.50 V
• Chemistry: Li-ion INR
• Discharge current: up to ~45 A transient / ~30-35 A steady*
  * Actual limits depend on BMS, cooling and manufacturer’s guidelines.

Key benefits

• High capacity 4200 mAh with high current – ideal for power modifications.
• Stable INR chemistry – a good balance of energy density, safety and cyclability.
• 21700 format – higher energy density compared to 18650.

Notes for use

• BMS (over/under voltage, current, short circuit protection) required.
• Spot welding (nickel/copper strips) is recommended; avoid overheating when soldering.
• Do not use damaged cells; charge only with Li-ion chargers according to specification.

FAQ

Does this cell have built-in protection (PCB)?
No, this is an unprotected 21700 cell – use in packages with BMS.

Is it suitable for a single cell with modules?
It is possible if a suitable charging/management module with guards is used.

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