Intel G2 SSD, 160GB. I see about 4.5hours* on main battery with office-type usage (browser, onenote, outlook, email, wifi). Haven't needed the slice yet * I haven't really had to test it yet either. Easily past 4 hours. I haven't determined exact benefits of keeping wifi on or off yet. Note 1) According to Battery Bar (freeware), 10% of my battery is busted anyways since it only charges to 39,827 mWh so tack on another half hour when/if I get a replacement battery. Note 2) I am (unfortunately) running mandated crapware, as in AV/firewall, and am still seeing good results. Note 3) You MUST reinstall HP Quick Launch Buttons, HP Security Manager, and HP Wireless Assistant if you want core functionality available to you.