i had good luck with Amazon for a replacement battery for my Dell Latitude - prime eligible product - mine was completely dead, to the point where i couldn't unplug and move my computer to another room without an issue! -- and i got one much, much cheaper ($24) than from Dell, NewEgg, and with more peace of mind on a great product than eBay (and the average price on eBay was what i paid on Amazon). and it was one of those times it arrived the next day instead of in two!