I purchased an upgraded battery on ebay from a seller in China with the seller name battery 918. The battery didn't work. The seller told me to charge the battery for 14 hours before attempting to use it. I read the battery thread here and tried charging it. My notebook still couldn't identify the battery and the battery wouldn't power on the notebook. The seller told me to mail it back and I would get an exchange. I sent it back. A month went by and I heard nothing from battery 918 so I sent them an email asking them what they were going to do. They told me that they never received the battery and that it was up to me to prove that I returned it. I told them that I was done fooling with them and I placed the sale in dispute with the credit card issuer. I got an email from battery 918 the same day saying that they found the battery had credited my paypal account with a full refund and please don't give them negative feedback. I then bought another battery from a different seller on ebay that ships from the US and received a great battery today. Beware of battery 918 on ebay if you upgrade your battery.