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Powerbook 15" - Battery Life

Message #1 - Posted 2004/01/26 - James John

Hi,

I Have a 3 month old Powerbook 15" 1GHz. Everytime I fully recharge the battery, the indicator only shows I have 3 hrs left and then quickly drops to about 2.5 hrs.

Is this normal or do I have a faulty battery.

Regards

James J

Message #2 - Posted 2004/01/26 - silverdr

James John wrote:

Hi,

I Have a 3 month old Powerbook 15" 1GHz. Everytime I fully recharge the battery, the indicator only shows I have 3 hrs left and then quickly drops to about 2.5 hrs.

Is this normal or do I have a faulty battery.

Of course it depends on many factors but I had a problem with the 15" TiBook 1GHz and I designed ;-) a test procedure.

0. Set your preferences not to turn off the display nor sleep on battery earlier than 20 minutes.

1. Get the battery fully charged

2. Log into Finder only (no background applications hogging the CPU)

3. Dim the display to only one, single brightness bar - it is the lowest that still emits light.

4. Unplug the PSU

5. Leave the machine idle for abt. 5 minutes.

6. Read the remaining off the screen (menubar)

You should get about (or above) 5 hours there.

Since I was getting only about 2.5 to 3 hours, and I _knew_ I should have more and even knew when and where it got lost, I returned the machine for maintenance. They replaced several things, including battery and I have my 5 hours back.

Message #3 - Posted 2004/01/26 - silverdr

silverdr wrote:

James John wrote:

Hi,

I Have a 3 month old Powerbook 15" 1GHz. Everytime I fully recharge the battery, the indicator only shows I have 3 hrs left and then quickly drops to about 2.5 hrs.

Is this normal or do I have a faulty battery.

Of course it depends on many factors but I had a problem with the 15" TiBook 1GHz and I designed ;-) a test procedure.

0. Set your preferences not to turn off the display nor sleep on battery earlier than 20 minutes.

P.S. CPU speed on battery: reduced

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