Regarding the charging method of lead-acid batteries.
Before connecting lead-acid batteries, calculate the charging voltage based on the number of batteries in series and set the voltage and current limit conditions. Charge the 12V lead-acid battery to 2.4V, reach the voltage limit state, and then set the voltage to 14.4V.
Select charging current based on battery size. For lead-acid batteries, their rated capacity is generally between 10% and 30%. A 10Ah battery with 30% charge is approximately 3A, which can be even lower. The 80A startup battery can be charged at 8A.
Lead acid batteries should always pay attention to the temperature, voltage, and current of the battery during charging, and should be charged in a ventilated environment. When the battery is fully charged and the battery drops to 3% of its rated current, the charging process is complete and the charging can be disconnected. If the current reaches the bottom and cannot be reduced, disconnect the charging after 16-24 hours. High self discharge will prevent the battery from reaching a low saturation state. The charging voltage of lead-acid batteries can also be set to be 10% higher than the recommended charging voltage to achieve equilibrium. The power supply can also be reverse sulfurized. Set the charging voltage above the recommended level, set the current limit to a low practical value, and observe the battery voltage. A fully sulfated lead-acid battery can initially absorb very small currents, and as the sulfuric acid layer dissolves, the current gradually increases. Raising the temperature and placing the battery on the ultrasonic vibrator may also help with this process. If the battery is not charged after 24 hours, it is unlikely to recover.
