Fogstar Energy -21700- Premium High Drain Li-ion Battery 4000Mah
£12.00
Quick Specs:
- Manufacturer: Fogstar
- Model: FS4000
- Size: 21700
- Capacity: 4000mAh
- Maximum Discharge: 40A
- Nominal Voltage: 3.6V
- Maximum Voltage: 4.2V
- Top: Flat-Top
- Protection: None




- Delivery & Return
Delivery & Return
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Lithium-Ion batteries should never be kept loose in your pocket or purse. Always use the case provided.
- Lithium-Ion cells should be charged on a dedicated charger rated specifically for Lithium-Ion cells.
- Never leave a battery unattended whilst charging.
- Keep away from animals and children.
- Wraps and insulators should be periodically inspected for tears or damage. If a battery has a damaged wrap, it should be repaired or disposed of immediately.
- If you are re-selling these cells, it is your duty to pass these warnings onto your customers.
- Batteries usually have a cycle life of between 200-500 cycles (varies with manufacturer) before noticeable capacity drop off. Batteries should be recycled at this time.
- Do not crush, incinerate or modify.
- Only use within manufacturers specification.
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Related Products
Features:
- XL Replacement Glass
- Compatible with the Vaporesso XTank T
- Top-notch Pyrex Glass
- Durable
- Silicon Seals Included
Specs:
- Manufacturer: Fogstar
- Model: FS3000
- Size: 18650
- Capacity: 3000mAh
- Maximum Discharge: 20A
- Nominal Voltage: 3.6V
- Maximum Voltage: 4.2V
- Top: Flat-Top
Features:
- XL Replacement Glass
- Compatible with the Vaporesso iTank
- Top-notch Pyrex Glass
- Durable
- Silicon Seals Included
We’ve all had a battery wrap tear on one of our 18650’s. Some of us continue to use them like that, which is incredibly unsafe. Others fix it with electrical tape, or just toss them in the bin. Well, now you can save all those unsafe batteries that have compromised wraps With high quality designed and unique wraps.!
Tips
- We highly recommend that you use a hairdryer when applying the new wrap. The old wrap MUST be removed first! Also, don’t lose the top plastic ring of your battery, it comes off with the old wrap.
- Damaged batteries can be dangerous, nicks and tears in the sleeves can cause direct shorts lead to battery venting and even fires. This solution is not only cheap its effective and very easy to apply.
Parameters
- Capacity: XL
- Material: PCTG(Pod)
- Compatible with all PnP coils including RBA
- Fill Type: Bottom Fill
- Quantity: 1pc/pack
Features:
- XL Replacement Glass
- Compatible with the Vaporesso iTank T
- Top-notch Pyrex Glass
- Durable
- Silicon Seals Included
We’ve all had a battery wrap tear on one of our 21700’s. Some of us continue to use them like that, which is incredibly unsafe. Others fix it with electrical tape, or just toss them in the bin. Well, now you can save all those unsafe batteries that have compromised wraps With high quality designed and unique wraps.!
Tips
- We highly recommend that you use a hairdryer when applying the new wrap. The old wrap MUST be removed first! Also, don’t lose the top plastic ring of your battery, it comes off with the old wrap.
- Damaged batteries can be dangerous, nicks and tears in the sleeves can cause direct shorts lead to battery venting and even fires. This solution is not only cheap its effective and very easy to apply.



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