I used the lithium-ion battery only for a short time. Should I charge it again immediately? Or rather use it again and discharge it?
If you expect your next use to be no longer than the remaining capacity will last, do not charge the battery immediately. The life of a lithium-ion battery is also determined by the number of charging cycles. Each charging cycle, even the shortest, is recognized by the battery as such; therefore, rather avoid charging the battery unless it is really necessary.