They are more often than not an exact measurement. To summarize, unless you have a terrible battery life, I'd say just don't take the numbers too seriously. So long story short, the calibration changes your voltage more often than gaining your capacity (Ah) back. To give you an example, when the lithium ion cell is full, it has a voltage of about 4.2 V, however when the battery level is low, the same voltage is around 2.8-3 V. The voltage however fluctuates in a given cycle. Now the Ah or capacity if you will, is the one that drops during the course of a battery's life.

Since it is a product of current voltage (V) and the cell capacity (Ah). Here is why - the wh is not a good scale to judge a battery. Nevertheless, this is a tricky number to interpret. However, I am skeptic, because, the current capacity is around 95000 wh, in comparison to the marketed value of 97000 wh. Fix laptop battery not charging plugged in not charging in windows 7/8/10-laptop battery not charging plugged in not charging-plugged in not charging-battery. After the first calibration run, I could bring the wear down to 3% and after the second run the battery monitor tool says 0% wear. I initially had 87000 wh with around 10+% wear.

Hey! I did battery calibration twice to my 3 months old XPS 15 9570.

Dell battery meter windows 10