My wife and I both have HPs and I bought her one of the extended life batteries at Best Buy before we left on our trip last year. They are expensive but worth it. They are genuine HP batteries which I would recommend over a generic battery.
http://www.bestbuy.com/site/HP+-+Lit...ract_desc=null
The description says it is for a G60. Although out of stock on line they might have it in the store. Good luck!