Fogstar Energy 4000 21700 Battery – 4 Ah, 40 A
Power longer and stronger with the Fogstar Energy 4000 21700 Battery. Offering an impressive 4,000 mAh capacity and a robust 40 A continuous discharge rating, this flat-top, unprotected cell is ideal for high-drain vaping devices and custom battery packs.
Key Features
- 4,000 mAh Capacity – Run your device longer between charges.
- 40 A Discharge – Supports high-wattage builds and demanding setups.
- Flat-Top 21700 Format – Fits the latest mods and mechanical setups.
- Fogstar Build Quality – Manufactured for reliability and safe performance.
Technical Specifications
| Brand | Fogstar Energy |
|---|---|
| Model | FS4000 |
| Type | 21700 Flat-Top, Unprotected |
| Capacity | 4,000 mAh |
| Nominal Voltage | 3.6 V |
| Max Voltage | 4.2 V |
| Continuous Discharge | 40 A |
Safety Notice
⚠ Important: This cell is unprotected—use only in devices or packs with proper battery management systems (BMS). Store in a protective case and inspect wraps regularly for damage. Always charge with a dedicated Li-ion charger.
Recommended Accessories
- Nitecore D4 Charger – Efficient and safe charging for 21700 cells
- 21700 Battery Case – Protect your cells during storage and transport
- Fogstar Energy 6000 21700 Battery – If you prefer extended runtime on lower amp demands
Why Fogstar Energy 4000?
- Exceptional mix of power and capacity for cloud chasers and high-performance users.
- Compact 21700 design and high amperage rating make it device-friendly and future-proof.
- Trusted Fogstar reliability ensures consistent and safe usage.
Original: $8.56
-70%$8.56
$2.57
Description
Power longer and stronger with the Fogstar Energy 4000 21700 Battery. Offering an impressive 4,000 mAh capacity and a robust 40 A continuous discharge rating, this flat-top, unprotected cell is ideal for high-drain vaping devices and custom battery packs.
Key Features
- 4,000 mAh Capacity – Run your device longer between charges.
- 40 A Discharge – Supports high-wattage builds and demanding setups.
- Flat-Top 21700 Format – Fits the latest mods and mechanical setups.
- Fogstar Build Quality – Manufactured for reliability and safe performance.
Technical Specifications
| Brand | Fogstar Energy |
|---|---|
| Model | FS4000 |
| Type | 21700 Flat-Top, Unprotected |
| Capacity | 4,000 mAh |
| Nominal Voltage | 3.6 V |
| Max Voltage | 4.2 V |
| Continuous Discharge | 40 A |
Safety Notice
⚠ Important: This cell is unprotected—use only in devices or packs with proper battery management systems (BMS). Store in a protective case and inspect wraps regularly for damage. Always charge with a dedicated Li-ion charger.
Recommended Accessories
- Nitecore D4 Charger – Efficient and safe charging for 21700 cells
- 21700 Battery Case – Protect your cells during storage and transport
- Fogstar Energy 6000 21700 Battery – If you prefer extended runtime on lower amp demands
Why Fogstar Energy 4000?
- Exceptional mix of power and capacity for cloud chasers and high-performance users.
- Compact 21700 design and high amperage rating make it device-friendly and future-proof.
- Trusted Fogstar reliability ensures consistent and safe usage.
