Also disconnect the charge after 16–24 hours if the current has bottomed out and cannot go lower high self-discharge (soft electrical short) can prevent the battery from reaching the low saturation level. Once the battery is fully charged and the current has dropped to 3 percent of the rated Ah, the charge is completed. Charge only at ambient temperatures in a well-ventilated room. Observe the battery temperature, voltage and current during charge. (A 10 percent charge rate is equal to 0.1C.) An 80Ah starter battery may charge at 8A. A 10Ah battery at 30 percent charges at about 3A the percentage can be lower. For lead acid, this is between 10 and 30 percent of the rated capacity. Select the charge current according to battery size. To charge a 12-volt lead acid battery (six cells) to a voltage limit of 2.40V, set the voltage to 14.40V (6 x 2.40). Lead Acidīefore connecting the battery, calculate the charge voltage according to the number of cells in series, and then set the desired voltage and current limit. Because of difficulties in detecting full charge with nickel-based batteries, I recommend charging only lead and lithium-based batteries manually. I stress manual because charging needs the know-how and can never be left unattended charge termination is not automated. Batteries can be charged manually with a power supply featuring user-adjustable voltage and current limiting.
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