Battery critical?

My laptop occasionally shows a sign "Battery critical." Once stood, the battery is not as powerful as when buying. The battery has been charged well enough. Does he really think I have to buy a new battery, or is it just the state of charge? I thought, new batteries are not worthwhile. The Sony Viau laptop is probably from 2013. Can it be the lack of battery that my apps are not open, Micrpsoft Solitaire and the Calculator.

Can be good on the battery, which are decrepit.

Thank you, that will be so.

I know that as well. Maybe a sales strategy? Since then I drive my laptop with charging cable. Goodbye the battery

So if your battery is 5 years old, it's time to change it. As the charging cycles reach their limits.

The question here is whether then rather a new powerful laptop is not worthwhile.