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How long does the internal battery usually last?

I keep seeing posts about the date going back to 1969 so I'm wondering what timeframe am I looking at to replace the "watch" battery. I bought my PB back in '04. Thanks.

PowerBook G4 17", Mac OS X (10.5.3)

Posted on Jun 10, 2008 6:55 AM

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Posted on Jun 10, 2008 7:39 AM

Yep, 4 years is about right.

It really depends on usage. Some don't see it come up till 5 years, but many do see it in their 4th year.
6 replies

Jun 10, 2008 10:06 AM in response to BFA

Until recently, I thought the PB backup batteries simply ran down. While visiting the Apple Store in Portland OR a couple of weeks ago, I mentioned this to one of the techs and he said the PB battery was rechargeable like the ones in the older G3 PowerBooks.

I was given a 2003-vintage PB17 recently that had been in storage (off power) for about six months. The backup would not support the time needed to change from battery to corded operation when running down the main battery. After having the PB on wall power for several weeks, I tried it again and the backup battery was able to allow the power switchover without the computer shutting down completely.

Based on a sample size of n=1, the backup could be rechargeable. My big grip is that the batteries are hard to find and darned expensive. Too many offered online are sold as "used." If it's not rechargeable, what's the point of a used battery?

Even rechargeable batteries have a finite lifespan so, if shopping for one online, get assurances that it is not used. I still have concerns about "new" batteries like this. If Apple has not made new parts recently, then those from inventory could be almost as old as the one you're replacing.

How long does the internal battery usually last?

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