Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T
Samsung 40T

Samsung 40T

Regular price £8.49 Sale price £11.49

This is not an 18650 cell, this cell is the new 21700 form factor. Cells will come with a free case for storage and protection.

Fogstar will always provide a case for storage and protection, as well as safety information to protect our customers. 

We recommend our customers fully charge cells before first use, using a dedicated battery charger rated for lithium-ion cells. Our selection can be found here. 


  • Model: 40T
  • Size: 21700
  • Manufacturer: Samsung
  • Country of Origin: South Korea
  • Chemistry: INR
  • Max. continuous discharge current: 25A (35A Temp Limited) - Rated by Mooch 
  • Nominal capacity: 3950 mAh
  • Nominal voltage: 3.6 V
  • Discharge end voltage: 2.5 V
  • Charging voltage: 4.20 +/- 0.05 V
  • Standard charging current: 1.5 A
  • Protection: Not Protected (Flat-Top)

Safety, storage and disposal

Lithium ion (Li-Ion) Cells can be dangerous if used improperly. By buying Li-ion batteries from Fogstar, the buyer assumes all associated risks.

  • Always use a battery charger that is rated for Li-ion cells
  • Batteries should never be left charging unattended
  • Batteries should never be loose in pocket or bag (use case provided)
  • All lithium batteries have a cycle-life, however a battery should be replaced every 2 years - whichever comes first.
  • Never continue to use a battery with a broken PVC wrap.
  • Never completely discharge batteries
  • Do not expose to extreme heat

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