My sis the same last year. I bought the best AGM battery that Sears had for the bike and have not looked back.
I am thinking of getting the YB18L-A. It is about $63 from an online source. I just don't really have a lot of money to spend on a very nice battery. The other recommended battery from Yuasa is an AGM which is a chunk more expensive.
http://www.zggtr.org/index.php?topic=3165
http://www.zggtr.org/index.php?topic=1465
When I needed a new one I googled "Advance Auto Coupon" and found a $35 off $85 code, bought the thing online, and had it waiting at my local store 20 minutes later. The first link is that thread. The guys gave a lot of good suggestions, and I think I found a good deal.
Edit: looks like they have $40 off $100 right now with code trt41.
http://www.retailmenot.com/showcoupon/4342826
from http://www.retailmenot.com/view/advanceautoparts.com
http://www.zggtr.org/index.php?topic=3165
http://www.zggtr.org/index.php?topic=1465
When I needed a new one I googled "Advance Auto Coupon" and found a $35 off $85 code, bought the thing online, and had it waiting at my local store 20 minutes later. The first link is that thread. The guys gave a lot of good suggestions, and I think I found a good deal.
Edit: looks like they have $40 off $100 right now with code trt41.
http://www.retailmenot.com/showcoupon/4342826
from http://www.retailmenot.com/view/advanceautoparts.com