If you use the Laptop mainly at Home I would suggest you remove the battery on Half charge and put in plastic bag and put in fridge As I have done. just use it when you really need to. For a new Battery for my laptop £160 they only last about two years if you leave them in all the time.
PS when you use the Laptop, connected to the Mains it starts to charge, you cannot stop it. Only by removing the battery or mains plug