Why Car Battery Easily Damaged

Car battery quickly damaged due to overcharge or over discharge. In the regular battery, the voltage drop to about 11 volts already mean large discharge. So at voltage of 11 volts the over-discharge happened. It means at 11 vollt, the battery should not be used again, it must be charged first. So the key is controlling discharge the batteries in order not to "run out". Use any batteries, using any alternator.. if you use it to over-discharge.. battery well will be broken again. The easiest to do is plug the digital voltmeter on the dashboard, read the battery specification .. what minimum voltage so as not to over-discharge. For example the minimum specification is 11 volts, well when the voltmeter on the dashboard is a 11 volt you need to conserve battery.


Below the charts discharge of a cell battere. Graph symbolize the characteristics of a cell battery. Because one cell has voltage of 2.1 volts, means it took 6 cell for 12 volt batteries. From the graph shows that for wet batteries (lead-acid?) In every cell, the voltage drop of 2.1 volts to 1.8 volts means 100% discharge. So for 6 cell means a drop of 12.6 volts to 10.8 volts (approaching 11 volt ) means 100% discharge. It appears that the cell voltage is approximately 2,025 VLT (12,15 volt batteries) is already 50% discharge (green box). At 1.93 volts (11,58 volt batteries) is 80% discharge (yellow box). In 1.775 volt (10.65 volt batteries) is 100% discharge.

Another cause is the overcharge, the excessive charge . It could be cut-off circuit in the alternator is damaged, so alternator continue charging even though the batteries are full.