My uMBP is 8 months old and has 33 cycles on the battery. Right now I am only using google chrome with 2 bars brightness and its telling me it will last for 2:17 min. Its currently at 93%. Bluetooth is off as well as the 9600m. Seems to me that it drains way too fast and charges way too slow. I did a full battery calibration last week and do them every couple months.
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What is wrong with my battery?
- Thread starter kawixsiyu
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GGJstudios
macrumors Westmere
Your battery time and percentage remaining will vary moment to moment, depending on the current load on your system. It's nothing to worry about. There are dozens of threads on this topic, which you can locate with a simple MRoogle search.
Calibrating a portable computer battery
About Apple Notebook batteries
Calibrating a portable computer battery
About Apple Notebook batteries
I have timed it a couple times before and have gotten 2.5 hours at most with just internet browsing and no flash.
GadgetGeek71
macrumors 6502
I drained it to 0% and let it sit for 5 hours about 6 days ago. I will try resetting it with draining to 20%.
GadgetGeek71
macrumors 6502
Sorry - I re-read your OP and edited my reply. Draining it to 0% is not a good idea. Although the batteries are not lead-acid, the ion lithium batteries will still dry and crystalize. The battery can over-heat and then you'll have REAL issues.
GGJstudios
macrumors Westmere
Just for clarity, draining a battery to 20% is not the same as calibrating. Also, draining a battery to 20% does not "reset" it.
Calibrating a portable computer battery
Draining a battery to 0% is part of the calibration process, and IS a good idea. Your information is inaccurate.
Calibrating a portable computer battery
GadgetGeek71
macrumors 6502
hmm...I heard different. I'm still a newbie at the iPhone thing...but I'm an electrical engineer who specializes in various types of batteries. not trying to B.S. anyone, just letting you know that I understand the working of batteries.
My G1 battery resets at or around 20%.
My G1 battery resets at or around 20%.
GGJstudios
macrumors Westmere
GadgetGeek71
macrumors 6502
iLog.Genius
macrumors 601
There's nothing wrong with your battery. If you have the removable battery, how long do you expect it to last? Theoretical time is 5 hours which is not going to happen. You should expect anywhere 3.5-4 hours. You might not be loading flash pages but internet browsing has a bigger load than say using Office or iLife. 2.5 hours with just web browsing I would say is within normal range.