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Good User

macrumors member
Original poster
Jul 23, 2014
57
1
My purpose is extending the battery lifespan of my rMBP battery. I only use it at home. I know it needs some modification in OS X or Battery firmware and it's not an easy thing to do, and no one has done it yet. Any possibility for this?


According to battery university keeping SoC between 20% and 80% is best for maximizing the lifespan of all kinds of batteries and car makers do this for electric cars' batteries, so why not to do this for laptops? for example imagine when the battery SoC reaches to 60% or 80% the light on magsafe turns green and charging stops.
 
My purpose is extending the battery lifespan of my rMBP battery. I only use it at home. I know it needs some modification in OS X or Battery firmware and it's not an easy thing to do, and no one has done it yet. Any possibility for this?


According to battery university keeping SoC between 20% and 80% is best for maximizing the lifespan of all kinds of batteries and car makers do this for electric cars' batteries, so why not to do this for laptops? for example imagine when the battery SoC reaches to 60% or 80% the light on magsafe turns green and charging stops.

I know this isn't the answer your looking for but you worry to much. Three or 4 years down the road when the battery is starting to perform poorly you will be in the market for a new Mac probably.
 
No need to worry about that. MacBook batteries are rated to hold at least 80% of its original capacity for 1000 cycles (one discharge from 100% to 0% is one cycle, one discharge from 100% to 50% is half a cycle).
I have a 2009 MBP with 518 cycles and still 83% battery health.

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This should answer most, if not all, of your battery questions:
Apple Notebook Battery FAQ by GGJstudios
The F.A.Q. includes the following topics:
  • BATTERY INFORMATION
  • BATTERY LIFE FROM A CHARGE
  • AC POWER
  • CALIBRATION
  • BATTERY LIFESPAN
  • CHECKING STATUS AND HEALTH
  • CHARGING
  • WHAT IS A CYCLE?
  • BATTERIES ARE NOT COVERED
  • BULGING OR SWELLING BATTERY

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