Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
If the battery in your computer is old, then what kind of computer is it please? a laptop, or a desktop model ?
Also, please describe other things about the problem - and what you need help with - so that I can tell, better, how to advise you or help you. Thanks. I'm waiting to hear back from you.