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The Essentials in 10 Seconds
- The 21700 Advantage: By being slightly wider than an 18650, it boosts its capacity to 3700mAh while keeping a brutal discharge rate.
- IMR Chemistry: The thermal stability of Lithium-Manganese guarantees safe intense use.
- The New Model: Updated manufacturing to minimize voltage drop under heavy demand.
Efest Purple 21700: Endless Strength
The Efest Purple family has found its best version in the 21700 format. If your mod accepts these batteries, you will take a massive jump in quality. With 3700mAh, you can forget about finding a wall plug for hours, while its 35A peak will keep your sub-ohm coils making thick clouds from the first to the last puff.
Technical Specifications
| Parameter | Technical Details |
|---|---|
| Model | Efest Purple IMR 21700 |
| Chemistry | Safe LiMn (IMR) |
| Nominal Capacity | 3700mAh |
| Dimensions | 21.5 mm diameter x 70.5 mm length |
| Max Continuous Discharge | 20A - 25A |
| Max Peak Discharge | 35A |
| Max Charge Voltage | 4.20V |
| Positive Pole | Flat Top |
Questions and Answers about the Efest 21700
Why do you recommend charging it before use?
Due to international air transport laws, all lithium cells leave the factory with a very low "rest" voltage level (around 30%). Charging them to 100% the first time properly "wakes up" the internal chemistry.
How do I take care of the 3700mAh so they don't degrade fast?
The secret to cell life is not overusing your mod's USB ports, which often send unwanted heat to the motherboard. Always use a dedicated Xtar charger to keep its life cycles perfectly intact.
