Please click on the image to enlarge it.
I was curious about the behavior of lithium cells at low temperature. In particular I was expecting capacity loss and voltage sag compared to the standard test temperatures of 20-25°C.
The tests above were conducted on a single cell, a Samsung ICR18650 26F, discharged at 1C.
The voltage sag and loss in capacity are lower than I expected. I am planning to do some -10°C tests to have even more data to compare.