[calvinmorrison]

My lenovo X220 has the most insane battery life I have ever had.

I had the 9 Cell battery (compared to the 3 cell) with the additional backpack chassis battery that clipped on below.

Just by itself the 9 cell was good for close to 10 hours.

Extended battery was: 64.38Wh and the extended 9 cell was 94Wh.

About a decade down the road, I still have about 50% battery life left in it at max charge and it still holds its own on an all day outing

[zelphirkalt]

I have an X200 with a 9 cell battery, bought new a while ago, but I think 4h max is what I get, if I lower brightness and only run Emacs or so. How do you manage to run 10h? Does the X220 somehow use less?

[calvinmorrison]

Probably not a new oem battery? The OEM 9 Cell was really good. Also - definitely need to tune it down with powertop, you can suspend most of the stuff like usb only the fly, also using and ssd over hdd.

Though, to be fair, this one had an HDD originally and has an "HDAPS" system. It's a built in gyroscope that will park the head of the disk if it notices the laptop is in free fall. how silly and fantastic that is

[smoldesu]

My x201 got ~6 hours of ontime with a new 6-cell battery, so I can believe a x220 hitting 10 hours on 9-cell.

[pengaru]

Penryn->Sandy Bridge is a pretty big leap.