I have lenovo battery problem?

Just go to a office supplies store like Staples and the staff members there will help you.

Do you have a question about it?

You might be right

You didn't give any details as to why you think the battery is the problem, so I wouldn't purchase a new battery just yet. Update your question and give details about the problem. It may be the charger, the connection to the computer, or a bad battery. It gets expensive when you start "guessing".