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OS X - Operating System General OS operation information and support

OS 10.6 - Snow Leopard - decreased battery life


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MotorcycleBetty

 
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Hello,

I upgraded to SL the day after it was released. The procedure went fine, with a couple of minor glitches like my printer not having proper drivers any more, but that's all been resolved.

What isn't resolved is that since the upgrade, my battery life SUCKS. I can't step away from a power cord for longer than 1/2 hour! And when it dies - with no alarm or other advance notice, mind you - the monitor indicates there's still 80% remaining (verified by 3rd party software).

I've tried resetting the PRAM & NVRAM as per Apple's instructions here: Resetting your Mac's PRAM and NVRAM and I've also reset the PMU as per Apple's instructions here: Resetting PowerBook and iBook Power Management Unit (PMU). I don't have any rogue apps sucking up juice, and everything would be great if I could just get this issue resolved without downgrading to Leopard.

Any ideas?
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Sur3Mac

 
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You can try recalibrating the battery again.

Overall SL hasn't been known to cause battery issues, so it must
be a software thing.

Regards

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MotorcycleBetty

 
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I agree 100% that it's a software issue because I was having zero problems with the battery before the upgrade. In Apple's support forums there have been quite a few other people who have experienced a problem like this since upgrading, but the vast majority of those have been solved by using the procedures I already related and there hasn't been any further meaningful discussion on the issue for about a week.

Using Apple's calibration method found here Apple Portables: Calibrating your computer's battery for best performance I am unable to precisely follow the directions because the computer isn't behaving in the expected manner, so I've actually avoided trying this. I don't get any alarm or other warning, and it's not going to sleep - nor is it shutting itself down safely - it simply dies. Rebooting after these incidents is a process that takes FAR longer than a normal boot of the system - about 4-5 minutes compared to 20-30 seconds. So I've been trying to avoid this, as it seems to be very hard on the machine.

However, I appreciate your response, and will give your suggestion a whirl, and try it out today. I should know by the end of the day if the recalibration works.

Betty
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MotorcycleBetty

 
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No go. After recalibration, I hit 76% and died without a sputter.
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Sur3Mac

 
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It's gonna take some time to look for it, but have you tried the latest Battery-Update yet?

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MotorcycleBetty

 
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I found the updater and checked my system. Everything looked OK except the firmware version (0110), so I ran the updater. The updater did not make changes to my system.
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mbohn

 
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You could go back to Leopard and see if the problem persists. If it does your battery is going bad. If not, SL is the problem.
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MotorcycleBetty

 
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I ended up in the Mac Store yesterday, and it turns out my battery was bad. So problem solved. Thanks to those who responded.
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