Using a Car Battery Hydrometer - testing each cell

Using a Car Battery Hydrometer - testing each cell This is how to test each cell in a car battery and find out which cells are weak or dead cells. The automotive battery may hold a resting charge at 12.7 volts and appear to be good, but a battery hydrometer will tell you & find what is the real condition of each battery cell. A battery hydrometer can also alert you as to when a car battery is starting to fail and this way you can replace the battery before you get stranded on the road somewhere. Sometimes a borderline weak car battery can be improves by doing a slow, low amps overcharge. This may work to desulfate the plates on an automotive battery, as long as you watch you do not overheat the battery during the charging process and keep the plates covered with distilled water. Don't get stranded with a bad battery. Test your car battery the right way.. This will also help avoid a frozen car battery in the winter and hard cold starting problems. The battery electrolyte will keep the battery from freezing and bursting in the cold winter.