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21700 BASEN 4000MAH 3.7V 30A BATTERY
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Basen 21700 4000mAh 3.7V 30A Battery
A high-capacity 21700 lithium-ion cell from Basen, rated at 4000mAh with a 30A continuous discharge. That combination is what makes it a favourite for sub-ohm vapers — the capacity gets you through a full day, and the 30A rating gives real headroom for low-resistance builds.
Supplied as a bare cell for use in 21700-compatible regulated mods and external chargers. The higher discharge rating makes it a sensible choice for high-wattage devices where a lower-rated cell would sag under load.
Features
- 4000mAh capacity for genuinely long runtime
- 30A continuous discharge rating
- 3.7V nominal output
- Built for high-wattage sub-ohm devices
- Sold as a bare cell for external charging
Battery Safety — Please Read
- Use a dedicated Li-ion charger and never charge unattended.
- Always carry cells in a battery case, never loose.
- Inspect the wrap before each use — re-wrap or retire any damaged cell.
- Use matched pairs in dual-battery mods and charge them together.
- Never build below the resistance your cell's 30A rating safely supports.
- Retire any cell that swells, gets hot in use, or has been dropped hard.
FAQs
Q: What does the 30A rating actually mean?
A: It is the maximum continuous current the cell can safely deliver. Lower-resistance coils pull more current, so the rating sets a floor on how low you should build.
Q: Will it fit my 18650 mod?
A: No. A 21700 is larger in both dimensions and will not fit an 18650-only device.
Q: Is the higher capacity worth it over a 3000mAh cell?
A: If you vape at high wattage, yes — the difference in time between charges is noticeable.
