BATTERY AND CHARGERS – SAMSUNG 40T 4000MAH 21700 BATTERY

DESCRIPTION 
REVIEW AS PER MOOCH
Samsung 40T 4000mAh 21700 Retests…an incredible 25A/30A battery
Bottom Line: This cell outperforms every 18650 and 20700 in regulated devices at up to about 20A-25A (60W-75W)
I can’t give the 40T and its rewraps a true 30A continuous rating any longer. But, I will give the 40T a temperature-limited rating of 30A as long at the cell is kept below 80°C.
At above 20A-25A/60W-75W the Samsung 30T is the better performer anyway. The 40T is best at low to mid power levels where it can be the most efficient. At higher power levels its internal resistance, about 25% higher than the 30T’s, causes more voltage sag than the 30T. The 40T is still an amazing 25A/30A battery though!
If you are running your mod at 60W-75W per battery you will have to try both the 30T and 40T to see which performs better for the way you vape. It’s just not possible to predict.
Since the 30T and 40T are in the same family of Samsung cells, and without a datasheet being available to confirm the actual rating, I am giving the 40T a rating that brings it to about the same temperature the 30T reaches at its rating. I am estimating this cell’s ratings to be 25A with a temperature-limited rating of 30A (if kept below 80°C) and 4000mAh.
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These tests only note the estimated ratings for these batteries at the time I tested them. Any battery that is not a genuine Samsung, Sony, LG, Panasonic, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” batteries or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.
Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a protected battery pack. Never exceed the battery’s continuous current rating and keep the plastic wrap and top insulating ring in perfect condition.
Any rating in my ratings tables can change at any time as different grade cells appear on the market, we get swamped with fakes, or new information becomes available to me. Please, never assume that the ratings in the tables are permanent and will never change! Always download the latest version before considering any cell purchase.
ADDITIONAL INFORMATION

Weight	0.05 kg
Dimensions	1 × 1 × 1 cm
Brand	Samsung
Battery mAh	4000