My old one could only hold about an hour of charge. I bought a new one for ~HK$1.5K (VERY REASONABLE!) from the Lenovo website. It took a little less than 2 weeks to arrive. Now the X40 is back to over 3 hours between charges. I couldn’t be happier.
My next Windows laptop will definitely be another Thinkpad. (Mind you, I am waiting for Apple’s ultra-portable, or new 64-bit duo core MacBook.)