LCD brightness on battery

[ThinkPad]

Does the brightness on the screen really effect the battery performance/life? If so, they how much when at 0 and at 7 when running on battery.

[Kenn]

Does the brightness on the screen really effect the battery performance/life? If so, they how much when at 0 and at 7 when running on battery.

The backlight on the LCD has a very large effect on battery performance. All things being equal, the only way to get the full advertised battery life (3-4 hours) is by using level 0. I've never tried to run down the laptop on Level 7, but I wouldn't be surprised if you get 2 hours or less.

[ThinkPad]

I just saw a full length movie on my T-41. Started with a little less than full battery gauge and not have 22% left. The brightness was set to 0, so you are right. The brightness does make a good difference. This is what im going to do from now on when im unplugged.

[dvorak]

You can use Mobile Meter, for example, to monitor the discharge rate, see for yourself, then check your battery's capacity and make some calculations on how much worktime you'll recieve.

[firstep]

I am so surprised you can set the brightness to 0 and watch movies.

For me, 3 is not bearable. At least 6. So I wonder if the backlight tube has sth wrong.

I just saw a full length movie on my T-41. Started with a little less than full battery gauge and not have 22% left. The brightness was set to 0, so you are right. The brightness does make a good difference. This is what im going to do from now on when im unplugged.