I have the x220 with a used 9-cell battery (last full charge was 75%) and I'm easily able to get just under 6 hours of standard use (browsing, WiFi, watching mo

I have the x220 with a used 9-cell battery (last full charge was 75%) and I'm easily able to get just under 6 hours of standard use (browsing, WiFi, watching movies, coding) and screen brightness at around 60%.