How to Solve Low Car Battery Voltage?

[Elena]

To address low car battery voltage, the solution is to charge it as soon as possible using a portable charger. For example, the charging method for a 12V 80Ah battery is as follows: use constant voltage with current limiting for charging—charge at 14.8V constant voltage and 20A current limiting for 16 hours, then switch to 4A constant current for 4 hours, totaling 20 hours. When the battery is fully charged, the following phenomena will occur: 1. A large number of bubbles will be generated inside the battery, creating a boiling effect; 2. The terminal voltage will rise to its maximum and no longer increase within two hours; 3. The electrolyte level will rise to its highest point and no longer increase within two hours; 4. Observe the battery indicator—the indicator will show green when fully charged.