Should I stop charging my laptop battery at 50%?
would it be beneficial for my laptops battery capacity health to limit the charging to say 50%, when my laptop is plugged in for extended periods of time?


Yes it would, most manufacturers of Li-Ion based batteries charge them to a charge level of around 40% to have the lowest stress level in the battery and extend their storage lifetime. (Actually the batteries are not charged at the factory but assembled such that they have a 40% charge level, the balance of the chemicals is made such that this happens)

So 40% (50% is close enough) could indeed result in a longer lifetime of the battery when you're not using it. But as soon as you start using the battery, the charge level drops so the battery could end up having a much lower charge level for a while which causes more stress on the battery making it wear out more quickly.

In the end it will be a compromise, do you want to have the maximum battery charge available to you and accept that the battery will wear out sooner, or will you accept a smaller battery charge but have a battery that will wear out less quickly?