I think new batch has improved something. I got mine 4-5 days ago, boot up out of the box, didin't install too much, 3 programs only, everything pretty much default, networks half 2.5G half wifi always on, skype and gtalk, 3 email accounts, 10G MP3, that's it, uptime now 4 days, never reboot, super stable, battery time is about 24-36 hours per charge, moderate used, about 2-3 hours web browsering, 1-2 hours music, some streaming video, 5-10 minutes phone call etc, every day.