Battery replacement

I bought my Na a little less than a year ago, I didn’t know for a few months after until I got it that it was running off of a lawnmower battery the entire time. I have my license and have tried driving it to school, while I get there fine in the morning it’s dead by the time schools out and I have to call a friend to help me jumpstart it. The battery may have worked for a time but now I have to replace it, are there any recommendations? Thank you all