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iBook Battery - How Long should it last?

Message #1 - Posted 2004/01/24 - bigdaddy

I was wondering what other people were getting for a typical time for the battery life a a clamshell iBook. I am no longer getting for time like I did before, I used to be able to watch a DVD and have it not even use half the battery now I am lucky if I get to watch the whole movie before the battery goes.
I took mine to CompUSA where I got my warranty from and first they said the battery is dead and now another guy ccalled and said it's fine the way it came in.
Isn't the battery pretty much shot if I can't even watch a movie with it?

Message #2 - Posted 2004/01/24 - Tom Stiller

Previously, bigdaddy wrote:

I was wondering what other people were getting for a typical time for the battery life a a clamshell iBook. I am no longer getting for time like I did before, I used to be able to watch a DVD and have it not even use half the battery now I am lucky if I get to watch the whole movie before the battery goes.
I took mine to CompUSA where I got my warranty from and first they said the battery is dead and now another guy ccalled and said it's fine the way it came in.
Isn't the battery pretty much shot if I can't even watch a movie with it?

The one in my wife's clamshell lasted about 3 1/2 years before its maximum charge dropped below an hour.

Tom Stiller

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

Message #3 - Posted 2004/01/24 - Gregory Weston

Previously, bigdaddy wrote:

I was wondering what other people were getting for a typical time for the battery life a a clamshell iBook. I am no longer getting for time like I did before, I used to be able to watch a DVD and have it not even use half the battery now I am lucky if I get to watch the whole movie before the battery goes.
I took mine to CompUSA where I got my warranty from and first they said the battery is dead and now another guy ccalled and said it's fine the way it came in.
Isn't the battery pretty much shot if I can't even watch a movie with it?

It really depends on how much you've used it. The batteries degrade over time and over charging cycles. I think it would be quite possible to burn through one in a year and a half. I also know that I'm still getting a decent charge on my late 01 iBook which spends a good chunk of its time plugged in. If you've got a clamshell with the original battery, I think you've done well.

G

Message #4 - Posted 2004/01/24 - y_p_w

bigdaddy wrote:

I was wondering what other people were getting for a typical time for the battery life a a clamshell iBook. I am no longer getting for time like I did before, I used to be able to watch a DVD and have it not even use half the battery now I am lucky if I get to watch the whole movie before the battery goes.
I took mine to CompUSA where I got my warranty from and first they said the battery is dead and now another guy ccalled and said it's fine the way it came in.
Isn't the battery pretty much shot if I can't even watch a movie with it?

Sounds about right to me. I understand that typical li-ion batteries are rated for 300 "deep-cycles" at which point you might have about half the capacity. All rechargeable batteries will lose a little bit of capacity after each charge - I believe part of it comes from losing water in the cell.

I hardly ever use the battery on my iBook - it's usually plugged in. When I do use the battery, I might use maybe 10% of capacity before recharging it. It understand the battery can last a really long time if the vast majority of the usage is for short cycles before recharging.

Message #5 - Posted 2004/01/24 - Darrell Greenwood

Previously, y_p_w wrote:

It understand the battery can last a really long time if the vast majority of the usage is for short cycles before recharging.

FWIW, after my original blueberry iBook battery failed in about 3 1/2 years and maybe only a dozen deep discharge cycles, I read up on lithium ion batteries. It seems li-ion start degrading, used or not, from the time of initial manufacture.

Aging is a concern with most lithium-ion batteries and many manufacturers remain silent about this issue. Some capacity deterioration is noticeable after one year, whether the battery is in use or not. The battery frequently fails after two or three years.

http://www.batteryuniversity.com/partone-5.htm

YMMV

Cheers,

Darrell

To reply, substitute .net for .invalid in address, i.e., darrell.usenet2 (at) telus.net

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