Vapcell 21700 // 4000mAh 30A (Samsung 40T)


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  • Purchase one Vapcell 21700 to receive a free plastic battery case 
  • Purchase two Vapcell 21700 to receive a free Vapcell zip carry case

"Bench Test Results: Vapcell Gold 4000mAh 30A 21700...appears to be Samsung 40T, beats 30T for regulated

Bottom Line: The Vapcell is identical in appearance and even a touch better in performance to the Samsung 40T’s I tested four months ago. Perhaps they tweaked the chemistry of the 40T since my test of it or the samples I tested then were a lower grade.

The Samsung 40T, and this rewrap of it, are incredible performers. They easily hit harder than any other cell available to us except the Samsung 30T and are a great choice at higher power levels. This cell and the 40T easily outperform the Sanyo NCR20700A for both regulated and unregulated devices.

While the hard hitting 30T is the king for unregulated devices the 40T and this cell beat out the 30T for high power regulated devices, delivering 8.1Wh at 30A down to 3.2V (about 3.6V when put in a charger) versus about 7.3Wh for the Samsung 30T. The Sanyo NCR20700A only delivered about 5.1Wh.

I am rating this Vapcell at 30A and 3900mAh. Its “typical” or “nominal” capacity is about 4000mAh."

- Mooch

  • Model: INR21700-3100mah
  • Size: 21700
  • Style: Flat Top
  • Chemistry: INR
  • Nominal Capacity: 4000mAh
  • Continuous Discharge Rating: 30A
  • Nominal Voltage: 3.7v
  • Protected: No
  • Rechargeable: Yes
  • Approximate Dimensions: 21.2mm x 70.32mm


These are high capacity and high discharge current batteries. If mishandled/mistreated they can cause serious injury. Use at your own risk.

Safety Notes:

Do not short.
Do not leave unattended when charging.
Do not leave unattended immediately after charging.
Do not carry in your pocket or purse unless they are in a secure non-conductive carry case.
They are not toys. Do not let your children or pets play with them.
Do not recharge with cheap chargers that keep on trickle charging after the normal cycle or that do not follow the Constant Current / Constant Voltage (CC/CV) algorithm properly.
Shipping: Please note that due to aviation safety regulations lithium batteries cannot be sent via air freight.
Batteries sometimes have a small sticker attached. This is used for international shipping declarations by battery wholesalers and can be removed. Battery-specific model numbers are printed directly onto the plastic wrap by the manufacturer.
Rechargeable batteries, regardless of where they come from require responsible use. Incorrect handling can lead to damaged hardware or serious injury.
Before using any rechargeable battery make sure you understand the risks and take proper precautions. Never leave charging batteries unattended and always place the charging device on a stable fire-proof surface. Do not use any battery or battery charger that is damaged in any way whether that damage is visible or internal. Always transport batteries in a non-conductive container and ensure that batteries cannot come in contact with each other. Dispose of batteries in a safe and responsible manner. Contact your local council to find out what programs are in place to help you dispose of your batteries.
VAPELAB will not be held responsible or liable for any injury, damage, or defect, whether permanent or temporary, that may be caused by the improper use of batteries.

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