What is the difference between the 3.6 volt and the 3.7 volt lithium-ion and lithium-polymer cells?

Q: What is the difference between 3.6 volts and the 3.7 volt lithium ion and lithium polymer cells?

R. This question has been on my mind for a few months. There is a lot of folklore out there about this. It confused me for two reasons. First, I have never heard of a higher burden of stress for some cells and not others. Second, 3.6 is only one golden rule of the average battery voltage anyway. The current tension varies between 4.2 volts and 3 volts (or 2.8) during discharge. It has a voltage. You can not put a counter in a cell and say 'this is a 3.6 volt cell "or" this is a cell of 3.7 volts. "

So I asked a friend who has a doctorate in chemistry from the battery and has been designing, testing and manufacture of lithium ion and Li-poly cells for over 15 years. The answer was:

No difference between 3.6V and 3.7V cells. The reasons why people say three. 6V 3.7 in one case and other cases are due to download speed. If the performance of lithium ion cells with a rate of 0.2C, the voltage of the midpoint of the cell is 3.7V. If the performance of lithium ion cells with a rate of 2C, the voltage of the midpoint of the cell is 3.6 V or more. The midpoint of a voltage of lithium ion cells, including cells of lithium ion polymer, is between 3.6 V and 3.7 V, type of variables for download.

In other words, it is mostly marketing hype. Now modern cells tend to maintain a higher voltage during discharge of the ancients, as the people who market could easily say "this makes the highest average, so let's call a 3.7 volt cell."

But why stop there? Why not rate the voltage as the peak voltage and get the jump on everyone? "It's a 4.2 volt cell, demand nothing less!"

So do not be achieved when selecting a drum.