The biggest capacity 21700 cell we stock. The Vapcell P42A delivers 4200mAh of capacity in a 21700 format — more than most comparable cells — paired with a 30A continuous discharge rating that keeps it capable across a wide range of regulated and mechanical mods. If all-day battery life matters more to you than peak wattage, this is the cell to reach for.

About the Vapcell P42A 4200mAh 21700

The 21700 format sits between the widely used 18650 and the larger 26650, offering significantly more capacity than an 18650 in a size that's compatible with any mod designed for 21700 cells. The Vapcell P42A exploits the format well — at 4200mAh it's one of the higher-capacity 21700 cells available, and while the maximum continuous discharge rate of 30A means it's not a cell to reach for in extreme high-wattage builds, it performs comfortably across the full range of regulated mod use up to around 80W.

Vapcell is known for producing accurately rated cells — the specifications represent real-world performance rather than inflated numbers. The P42A is a particularly solid choice for dual-21700 mods where long-running sessions between charges are a priority, and for single-cell mods with 21700 compatibility where day-long use without a recharge is the goal.

Use only in mods and devices with built-in protection circuits (regulated mods). Store in a proper battery case when not in use. Check your device's compatibility with 21700 cells before purchasing — not all 18650 devices accept 21700 without a sleeve adapter.

Specifications

• Format: 21700

• Capacity: 4200mAh

• Continuous Discharge Rating (CDR): 30A

• Nominal voltage: 3.6V

• Manufacturer: Vapcell

• Flat top cell