That depends on the age and quality of the laptop. It's been a while since some started directly running off the cable when the battery is full.
It gets worse.
Her dad is implied to want to abuse her, and she feels empowered after unbuckling one of their pants after he initially doesn't want to do it, since she's doing it on "her terms". And he starts crying afterwards. The whole thing is real fucked up.
Understandably both the miniseries and movies ignore and skip that whole thing.
It just goes primarily after kids because it’s easier to drive them to terror (adult fears are more complex)
They weakened it, and did something that changed how it can interact with them by transitioning to a different state. Unifying, just like with the fight, as a way to overcome the power. That's why they remember the way out after the act. Which shows that it was literally a way for them to escape the power, at least temporarily.
The sexual act connected childhood and adulthood. It's another version of the glass tunnel that connects the children's library and the adult library.
-Stephen King
The book even specified that the intent was for them to be together and unified as a group again, like they had to be for the fight. And they instantly remember the way out after they're finished. Just because they don't spell out that their explicit intent was to escape him by having sex, doesn't exclude that meaning.
A few notes:
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They were 11
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She describes it in way more detail than you'd ever want
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It was supposed to be them going from innocent kids towards adulthood, so Pennywise would no longer want to eat them. And it is how they find their way back out.
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It was written towards the tail end of his over decade long alcohol and cocaine binge(he doesn't remember writing several of the books in that period, especially Cujo)
No! Stop acting like they're all stupid, that's what they want you to think.
He was a pancreatic surgeon at Johns Hopkins. It's literally impossible for him to not be familiar with diabetes unless he has experienced serve memory loss recently.
He's pushing eugenics and wanting to kill off people with chronic illnesses
Their comment was indicating that laptop batteries will be damaged if left plugged in constantly. Which is a thing that can happen with some laptops, and most old ones.
My comment was about how some modern laptops when left plugged in, will charge the battery and then start running directly from the wall-power once the battery is full. They bypass the charging once it is indicated to have a "full charge".