A car battery is an important part of a car. Without it cant function, so understanding how it works and keeping it maintained can be valuable. This post outlines some basic, informative notes about a lead acid car battery.
A lead acid battery is made up of plates, lead and lead oxide (various other elements are used to change density, hardness, porosity, etc.) with a 35% sulphuric acid and 65% water solution. This solution is called electrolyte which causes a chemical reaction that produce electrons.
If a battery needs to be tested, a hydrometer will be needed. To measure, you will need to measure the amount of sulphuric acid in the electrolyte. If the reading is low, that means the chemistry that makes electrons is lacking. If the sulphur has dropped, it means it has stuck to the batteries positive plates.
When you recharge the battery the sulphur will return to the electrolyte.