21700 Battery – What It Means for Vaping Devices

Definition

A 21700 battery is a high-capacity rechargeable lithium-ion cell that measures 21 mm in diameter and 70 mm in length—slightly larger than the popular 18650 battery. Designed for high-drain vape mods, it stores and delivers the electrical energy needed to heat your coil and produce vapour. Its extra size lets it hold more milliampere-hours (mAh), giving Australian vapers longer vaping sessions between charges without sacrificing the fast discharge rates demanded by sub-ohm builds.

Technical Details

How It Works

Inside a 21700 battery, a lithium-ion chemistry shuttles ions between a graphite anode and a nickel-based cathode. When you press the fire button, the circuit closes and electrons flow from the battery to the Thread“>510 thread connection, powering the coil. Most 21700 cells offer continuous discharge ratings between 25 A and 40 A, with capacities ranging from 3 000 mAh to 5 000 mAh. Common variants include the Sony VTC6A (high capacity, 30 A), Samsung 40T (balanced 4 000 mAh/35 A), and Molicel P42A (high-drain 45 A). Always check the wrap for specs—never assume all 21700s perform the same.

Usage & Tips

Before first use, verify your mod accepts 21700 cells; some dual-battery devices also fit 26650 battery adapters. Safety: inspect wraps for tears, charge only on an external charger, and never exceed the cell’s amp limit. If your mod reads “weak battery” at mid-charge, the cell may be sagging under load—try a higher-amp model. Store spares in a plastic case away from keys or coins. When mixing with Nicotine“>0mg nicotine or 3mg nicotine e-liquids, remember that higher wattage drains the cell faster; carry a spare 21700 for all-day vaping.

History & Context

Originally developed for electric vehicles, the 21700 format was adopted by the vape industry around 2017 as users sought longer battery life. Today, most flagship single-18650 mods now offer 21700 versions, and entry-level kits increasingly ship with this format as prices fall.