Craftman 15hp won't start with the key and how it stay charged

Have you tested the battery ?

How often is it being used ? Is it merely going dead from weeks of non use ?

Please stop posting the same question over and over and over and even reporting your post as being in violation of the rules.

It may take some of the expects several days to get online, to review questions

Maybe you can give us some details before we even try to help you. What exactly happens when you turn the key? Does the engine turn over at normal starter speed or just slow grind or clicking? Have you tried jumping with a another battery or you car?