New 2015 MacBook showing 4844 mAh at full charge.

2015 MacBook Retina 12" with top configuration (1.3 GHz processor). After 128 cycles the battery capacity is down 16%, if we consider a 39.7 Watt-hour initial capacity. At the moment the Full Charge Capacity (mAh) is listed at 4438 mAh, so that gives us roughly 33.3 Watt-hour battery capacity. The Full Charge Capacity is slowly but constantly decreasing with each charge it gets. Would have expected to decrease slower than this, to be honest, especially since it showed a full charge capacity of ~4900 mAh for or ~50-60 cycles and looked like it was stable at that value. Then it started decreasing, constantly.

As a mention, the laptop is used almost daily in the following manner: several days in a row on cable (battery full, not charging) than on battery (1-2 days), then charged again and plugged in and so on. That's why it has only 128 cycles in 1.5 years of almost daily use.

So, I spend $1300 on a brand new macbook pro, 13" 256drive, 8gb ram. The battery came with 4800 mah out of the box. That calculates to roughly to a 5 hour battery. Half of what Apple claims. And this is normal web searching. No videos. I am very upset. They have + $900 billion in cash. I guess they are good at ripping the customer off. I think I am returning this one! Shame Apple.

Thanks for the posting I found it useful some years later. I just got a New refurb MBP 13" early 2015 and noticed the Batter does not last 9.5 hours as Apple claims. Thinking I was cheated out of a good battery I looked deeper to find it's fine and using this post as well as finding tech specs supported that. Thanks

There are some general bits of information to read through and see how they apply to your

computer situation, and configuration of software + hardware specification...

•Mac notebooks: All about batteries - Apple Support

Battery life expectation can vary with conditional use, situations, and personal preferences.

•MacBook (Retina 12-inch, Early 2015) - Technical Specifications

Hopefully the unit will see some increase in battery life, depending on load factors, temperature

and other use factor including environmental; however if the unit is relatively new, you may seek

the advice of an authorized Apple trained specialist or at least see if the Apple Store genius can

look into it to see if there's an indication of an issue. Slight difference between your experience

& a stated higher battery life could be accounted for in how the computer is used, & where.

In any event...

Good luck & happy computing! 🙂

my battery is at 4954 mah after 20 cycles. Not going up but still going down. Poor battery life even though it shows normal; absolutely unacceptable that it decreases so fast

hello! I just bought my macbook pro retina 13' last week and its full charge capacity also dropped like yours after 6 cycles! reading your post gave me hope these values might increase again overtime! could you give me any tips that might help? I'm quite worried and don't know if I should be taking it into apple. thank you!

2015 Retina Macbook here (12") - the battery capacity is a bit over 91% after 9 cycles. Not good.