Hi Just an update, I needed a replacement NON OEM battery for one of the X61s I have with a totally dead battery (that is something you have to factor in to buying stuff from auction) Cost me &pound;17 inc delivery on eBay and its a 77Wh one. This is currently showing 5hours remaining and I've been using the laptop for about an 1 1/2 hours. So don't be afraid to pick up one with a duff battery if cheaper as a replacement is not expensive and with the SSD give a working days life to the PC. So even with New SSD and Battery the X61s only set me back &pound;93. If your lucky you may find one really cheap on eBay, Happy shopping!!! 