To understand how much to charge a 60ah battery, firstly you must determine the degree of sparsity of the battery. The average time to charge a dead battery is 10 to 12 hours. If a 60ah battery is put on charge at 6 amps when it has only 11.7V with an electrolyte density of 1.1 g/cm³, it will regain its full capacity in 14 hours. The final time depends on the level of discharge. The battery is considered fully charged when the voltmeter on its terminals will show 12.73V, and there will be active boiling of electrolyte.