Is it ok if I charge MBP even battery is 90% ?

I always use ac power when using my MBP late 2011. then if wanna sleep, i will sleep my MBP and disconnect the ac power. when i open back, the battery is below 100% and then i connect back my MBP to continue my work. is it okay for my battery?
sometimes i used until 75% or 45% if i need to go study somewhere. then i connect the ac power when at home to use ac power. its normal right?

it shouldnt cause damage, the below 100% could be from a multitude off problems if the computer is in sleep and not shut-off it is probably proccecess that run regardless of you not using it. ie operating systems procceces that turn it on when you move your mouse. its nothing to be worried about. you cannot overcharge like our friend said before me aswell. most computers have a regulator in them if not in the powercord that keep the currant at a certain voltage. for example a car runs on around 12.5-7 volts depending on the model and is drained at 12.1 or lower you add a current to it at 12.6 and it will recharge but not overcharge. so dont worry about it.

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