irregular voltage regulator

[tubman]

When you put additional voltage into a battery at a high amperage rate, the excess energy the battery can't absorb is turned into heat. A 30 amp overcharge at 5 volts has the potential of generating 150 watts. I don't think that much heat can do any substantial damage over a short period of time, but things will be different if it would go on for multiple hours. Overcharging has "boiled" and ruined batteries, and even started fires in the past, but it usually took many hours.