No- the inside of a li-ion battery looks like this: https://www.researchgate.net/profile/Jigang-Zhou/publication/310734722/figure/fig2/AS:431587125927942@147990

No- the inside of a li-ion battery looks like this: https://www.researchgate.net/profile/Jigang-Zhou/publication/310734722/figure/fig2/AS:431587125927942@1479909797975/Full-three-dimensional-rendering-of-jellyroll-assembly-inside-the-pouch-cell-The-heat.png https://www.researchgate.net/profile/Jigang-Zhou/publication... Li-ion battery comes off the production line as one continuous, miles-long tape that is rolled into shape and then sliced off. The tape is made of a few layers, and li ions move from one layer to another. All of the movement cancels out. You could measure the state of charge by mass, though! As electrons are moved from anode to cathode, they occupy a lower energy state and therefore have less mass. You'd measure that in eV, electron-volts: convert amp-hours to coulombs and you have the number of electrons, and the average voltage change is from roughly 3.7 volts to 3.2 volts. Or you could use the much easier formula- E=MC^2 :D