Molicel P42A – 21700 3.6V 4200mAh 45A Li-ion Cell

Authentic Molicel P42A 21700 lithium-ion cells — a high-capacity, high-drain cell built for demanding applications. Cells only; buy 1 or 2.

Choose your quantity

• 1 cell
• 2 cells

Looking for a storage case? We sell a clear 2-cell 21700 protective case separately.

Specifications

• Model: Molicel INR21700-P42A
• Nominal voltage: 3.6V
• Capacity: 4200mAh (4.2Ah)
• Chemistry: Li-ion NMC
• Max continuous discharge: 45A
• Max pulse discharge: 50–55A
• Charge voltage: 4.20V  |  Cut-off: 2.50V
• Approx. weight: 67g
• Terminal: Flat top (unprotected)

Common uses

Power tool pack rebuilds, e-bikes and scooters, robotics, DIY electronics, and other high-drain builds.

Important safety information

These are bare, unprotected cells intended for pack building by users trained in lithium-ion handling.

• Assemble only with a proper BMS, insulation, and spot welding
• Do not solder directly to cells
• Never charge unattended or exceed 4.20V per cell
• Do not over-discharge below 2.50V
• Never use cells with damaged wrappers — rewrap before use
• When building packs, use cells of matched capacity and internal resistance

Building or rebuilding battery packs? For cells, nickel strip, BMS boards, insulation rings, and other rebuild supplies, browse the rest of the RenewSpark store.

Assembly and use are at your own risk. Misuse can cause fire or injury. See our Terms of Service for full details.