My battery died some time ago in my dv3T model laptop and I was very excited to find this only to find that it does not fit my specific model. If you bought your dv3 series from HP i.e. had them build it for you, it doesn't fit. Otherwise shipping and cost were reasonable (as was the return shipping when I found that it didn't fit).
In spite of this one instance, I plan to buy other things from BestBuy in the future.