Samsung 40T 21700 4000mah

The Samsung 40T 21700 4000mah battery is an outstanding cell for those who like high capacity without sacrificing a lot of discharge/drain capability.

*** These batteries are NOT recommended for unregulated devices or mech mods and should NOT be in mech mods/tube mods.

*** It is good practice to ‘marry/pair’ up a set of batteries to ensure the lifespan of the two is similar.

***It is better and safer to use a proper external charger when charging batteries to ensure longer lifespan, safe charging and balanced charging.