I recently learned how how energy actually flows in batteries, the electric and magnetic fields create an energy vector pointing into the circuit at all points and out of the battery. This broke my preconception that electrons are converted into energy which produces light when powering something like a light bulb. I'm confused on how batteries lose charge then if all energy is conserved in the system and electrons are not directly converted into energy. (this is my first post, so sorry if I didn't follow the rules correctly)
How do batteries lose charge?