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Message: <blockquote data-quote="3dogs" data-source="post: 1032283" data-attributes="member: 424">The battery's internal resistance increases as it becomes charged. With more internal resistance the amount of current (amps) that is delivered to the battery goes down. That's why it doesn't overcharge.However, I you connect a high-amperage, automotive type charger and pump 40 amps into a motorcycle battery heat will melt the case in no time. Even though the internal resistance is high when the batt is charged the excessive amperage from the charger just turns into heat. Then it becomes a question of which component can stand the most heat---the giant-assed battery charger or the small battery.</blockquote>