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Bad PowerBook battery: only 2509 mAh left

Message #1 - Posted 2006/05/27 - Markus Dehmann

My PowerBook battery is pretty bad and runs for just about 2 hours. CoconutBattery says the max. capacity left is only 2509 mAh (57%) after 321 cycles. New batteries have 4400 mAh.

This is not normal, right? Will Apple replace the battery for free? The PowerBook is just a year old now, and I have the AppleCare 3-yr protection plan.

Does anyone have similar experiences and got the battery replaced? What's the typical mAh after a year?

Thanks!
Markus

P.S.: I did a PMU reset, but it didn't help.

$ ioreg -w0 -l | grep Capacity

"IOBatteryInfo" =

({"Capacity"=2509,"Amperage"=18446744073709549624,"CycleCount"=321,"Current"=126,"Voltage"=10658,"Flags"=20,"AbsoluteMaxCapacity"=4400})
Message #2 - Posted 2006/05/28 - Tom Stiller

Previously, Markus Dehmann wrote:

My PowerBook battery is pretty bad and runs for just about 2 hours. CoconutBattery says the max. capacity left is only 2509 mAh (57%) after 321 cycles. New batteries have 4400 mAh.

This is not normal, right? Will Apple replace the battery for free? The PowerBook is just a year old now, and I have the AppleCare 3-yr protection plan.

Does anyone have similar experiences and got the battery replaced? What's the typical mAh after a year?

Thanks!
Markus

P.S.: I did a PMU reset, but it didn't help.

The microprocessor on the battery can be re-calibrated by allowing the PowerBook to run until the depleted battery shuts it down and then charging it fully.

Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF

Message #3 - Posted 2006/05/28 - M-M

Previously, Markus Dehmann wrote:

My PowerBook battery is pretty bad and runs for just about 2 hours. CoconutBattery says the max. capacity left is only 2509 mAh (57%) after 321 cycles. New batteries have 4400 mAh.

This is not normal, right? Will Apple replace the battery for free? The PowerBook is just a year old now, and I have the AppleCare 3-yr protection plan.

Apple will not replace it. The Applecare agreement specifically excludes batteries. (I tried but if it's only a year old, they might)

fyi, mine is at 1951 mAh (44%) after 33 months and 685 load cycles and runs for less than 1.5 hours. I'll get a new one soon.

If you cycle the battery, you can usually get some mAh's back.

m-m

Message #4 - Posted 2006/05/28 - M-M

Actually there is an upside to the battery losing it's capacity:

It takes much less time to charge completely :)

(that's like the upside to high gas prices is it takes less time to put $40.00 in)

m-m

Message #5 - Posted 2006/05/30 - Markus Dehmann

Tom Stiller wrote:

Previously, Markus Dehmann wrote:

My PowerBook battery is pretty bad and runs for just about 2 hours. CoconutBattery says the max. capacity left is only 2509 mAh (57%) after 321 cycles. New batteries have 4400 mAh.

This is not normal, right? Will Apple replace the battery for free? The PowerBook is just a year old now, and I have the AppleCare 3-yr protection plan.

Does anyone have similar experiences and got the battery replaced? What's the typical mAh after a year?

Thanks!
Markus

P.S.: I did a PMU reset, but it didn't help.

The microprocessor on the battery can be re-calibrated by allowing the PowerBook to run until the depleted battery shuts it down and then charging it fully.

Thanks, that helped a bit. After recalibrating the battery has now 3021 mAh (68%).

Markus

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