Lithium ion battery lifetimes are rated in charge "cycles", meaning one full charge and one full discharge. So if you discharge your battery to 75% and then top it up, that's 1/4 of a cycle. The average life is 500 cycles before the battery begins to exhibit a reduced capacity, and it's almost impossible to significantly change the lifespan with normal use.
Long story short, don't worry about it. Just use your device and charge when needed.
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