There’s something called a RC time constant. R is resistance, C is capacitance. The time is what you get when you multiply them, and is how long it takes to charge(most of the way, the rate of charge slows down the more full it gets, because the difference in voltage gets smaller) Even capacitors have some series resistance and inductance in the leads of the component, so there’s always some amount of time it takes to charge. For small ceramic capacitors it can be pretty quick though.
When you’re charging a battery, you could put current in faster, but it would change what you’re doing chemically inside the battery. It takes time for the needed chemicals to get to where the desired reaction takes place, and if you push it too hard instead of the chemical reaction you want you might get something completely different, like decomposing the electrolyte, or you might overheat the cell to the point it self discharges and catches on fire.
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