Consider the circuit shown. You recognize the circuit from the last experiment, which has been extended by a second push button switch, a LED and a resistor.
Only when the capacitor is discharged, it can be recharged again while observing the charge current. This can be repeated as often as you like...
Certainly you have realized that the capacitor can not replace a battery. The LED lights up too briefly to be of any practical use.
In the next experiment, it is all about how much energy a capacitor can store and what the unit Farad stands for.