MacBook Pro Battery

bowjest · #1 September 6th, 2009, 02:13 PM

How long should the battery in my MacBook Pro last?

I've had the computer about a year and am pretty sure that what was once about 5 hours of lifespan has dropped to about 3.5.

Does that sound right?

**fryke** · #2 September 6th, 2009, 03:06 PM

"about a year" sounds dangerously close to the one-year warranty of batteries. (No 3-year warranty even under AppleCare!) Call AppleCare immediately with details about the battery (charge cycles etc.) that you can find in System Profiler. After a year, the battery should still be good. After two to three years, not so much...

**Giaguara** · #3 September 6th, 2009, 03:10 PM

Should last at least 300 cycles.
Apple (from upper left corner) > About this Mac > More info >> Hardware > Power. What does it show as cycle for battery?
Batteries are consumables, they don't have a 12 months warranty.

djackmac · #4 September 6th, 2009, 05:20 PM

Quote:

Originally Posted by Giaguara

Batteries are consumables, they don't have a 12 months warranty.

Yeah, they actually do have a one year warranty under certain circumstances. If you believe the battery may be bad, take your laptop to an authorized Apple shop. They will have access to the battery and AC adapter diagnostic. This diagnostic either shows the battery as good, bad, or consumed. If its determined bad it will be replaced by Apple, otherwise it will not. But to tell the truth what you are saying about your drop in performance doesn't sound too far from ordinary.

**fryke** · #5 September 6th, 2009, 05:34 PM

They do have a year in Switzerland. Didn't know it's less in other countries, sorry.

kmrua65 · #6 September 6th, 2009, 06:53 PM

Is not it? Take a look at how long my

bowjest · #7 September 7th, 2009, 01:27 PM

Thanks to everyone for your feedback. Here is what I have:

Battery Information:

Charge Information:
Charge remaining (mAh): 2239
Fully charged: No
Charging: No
Full charge capacity (mAh): 4499
Health Information:
Cycle count: 90
Condition: Good
Battery Installed: Yes
Amperage (mA): -1284
Voltage (mV): 11278

At several point since last night it has said I've got 1h 30min of charge, then 2h 10min, then 1h 50min, then 1h 58min (the current reading).

In short: it's all over the place and nothing seems to be reliable or predictable about it.

I'll get in touch with the Apple Store where I bought it and see what they say.

Thanks again.

**Giaguara** · #8 September 7th, 2009, 04:01 PM

If it's past 6 months and you have any higher cycle count, it'll have to behave very faulty, as in showing clear fault before it's changed. If you take it to service after 3 months and 400 of cycle count, that will be normal consume. So that depends.

Did you try recalibrating it?
http://support.apple.com/kb/HT1490
http://www.apple.com/batteries/