How to recalibrate Macbook Pro 15" Retina Battery?

I am at my wit's end with this battery indicator! I just exchanged my macbook pro 15" (mid 2014) for a new one due to the faulty speakers and now I am having issues with my battery indicator! I just recently upgraded to Yosemite and all of a sudden my login battery indicator isn't the same as the one on my desktop. After I restarted or shut down my laptop, upon logging in, I saw that my battery was at 94%. Then after logging in my battery is at 100% (without plugging in my power adapter).
Now plugging in my charger made it all weird. At 96% (login page) my battery indicator jumped to 100% and when I logged in it stayed there. I don't know if it's my battery because this is fairly new.
I also try to use coconutBattery and got the same result as the login page indicator. It's quite frustrating as to know if my battery will run out at 10% or not without the coconutBattery app.
Does anyone have this issue as well? or am I the only one?
If anyone has this problem, does anyone know why this is happening?
My battery now is at 100% but CCB says it's 95.5%. It's very frustrating.
Should I just go back to PC world and get this exchange again??
UPDATE: I did PRAM, SMC and even reinstalled and erased disk utility but only got as far as a 2% discrepancy. Seriously I'm beginning to get very frustrated

rljtiam,
I don't know if this will help you any but I noticed that I experience the same issue on my Macbook Pro 13 inch with the battery percent being different at the login screen then compared to after I've logged in. But only when FileVault is turned on. When I have FileVault turned off the battery estimate at the login screen seems to work the same as when I'm logged it. And to make things even more strange it seems to only relate to the initial login. If after I've logged in then log out the login screen displays the same battery percent as when I'm logged in.
I noticed other little things at initial login when FileVault is turn on too. Such as no backlight on the keyboard or not being able to adjust any settings using the function keys on the keyboard.
You can see if you have FileVault turned on by going to:
System Preferences > Security and Privacy > FileVault ( Tab )
Now I'm not suggesting you turn FileVault off if it is indeed enable. I just wanted to point out that I've come across something similar and believe that FileVault is the culprit. Possible in the way it secures the system.
As for any other battery troubles your are having I'm Sorry. I don't have much experience in such and I might do as Kappy and Ralph have suggested.
Also If your interested I might send Apple some feedback. You can do so using the following links:
Related to Mac OS: https://www.apple.com/feedback/macosx.html or
Related to Macbook Pro: https://www.apple.com/feedback/macbookpro.html
I wish you the best of luck,
Weston
Sorry if I was confusing and rambling or if you feel it doesn't help and or relate.

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To add just a little
Keep it plugged in when near a socket so you keep the charging cycles down on your LiPo (lithium polymer) cells / battery, but not plugged in all the time. When not being used for several hours, turn it off.
And best "tip" is if its near a socket,...plug it in as long as you can (especially at home) since cycle count on the battery are the "miles that wear out the tires (battery)", however again, not plugged in all or most of the time.
http://www.apple.com/batteries/notebooks.html
"Apple does not recommend leaving your portable plugged in all the time."
General rule to remember of Lithium batteries is:
Never drain them LOW & dont always/often store them HIGH
While cycle count is commonly seen to be the “miles” on your Lithium Ion pack cell in your Macbook, which they are, this distinction is not a fine line at all, and it is a big misconception to “count charge cycles”
*A person who has, for example, 300 charge cycles on their battery and is recharging at say 50-60% remaining of a 100% charge has better battery usage and care than another person who has 300 charge cycles at say 15% remaining on a 100% charge.
DoD (depth of discharge) is far more important on the wear and tear on your Macbook battery than any mere charge cycle count. *There is no set “mile” or wear from a charge cycle in general OR in specific.    As such, contrary to popular conception, counting cycles is not conclusive whatsoever, rather the amount of deep DoD on an averaged scale of its use and charging conditions.
                          (as a very rough analogy would be 20,000 hard miles put on a car vs. 80,000 good miles being something similar)
*Contrary to some myths out there, there is protection circuitry in your Macbook and therefore you cannot overcharge it when plugged in and already fully charged
*However if you don’t plan on using it for a few hours, turn it OFF (plugged in or otherwise) ..*You don’t want your Macbook both always plugged in AND in sleep mode       (When portable devices are charging and in the on or sleep position, the current that is drawn through the device is called the parasitic load and will alter the dynamics of charge cycle. Battery manufacturers advise against parasitic loading because it induces mini-cycles.)
Keeping batteries connected to a charger ensures that periodic "top-ups" do very minor but continuous damage to individual cells, hence Apples recommendation above:   “Apple does not recommend leaving your portable plugged in all the time”, …this is because “Li-ion degrades fastest at high state-of-charge”.
                    This is also the same reason new Apple notebooks are packaged with 50% charges and not 100%.
LiPo (lithium polymer, same as in your Macbook) batteries do not need conditioning. However...
A lot of battery experts call the use of Lithium cells the "80% Rule" ...meaning use 80% of the charge or so, then recharge them for longer overall life.
Never let your Macbook go into shutdown and safe mode from loss of power, you can corrupt files that way, and the batteries do not like it.
The only quantified abuse seen to Lithium cells are instances when often the cells are repeatedly drained very low…. key word being "often"
Contrary to what some might say, Lithium batteries have an "ideal" break in period. First ten cycles or so, don't discharge down past 40% of the battery's capacity. Same way you don’t take a new car out and speed and rev the engine hard first 100 or so miles.
Proper treatment is still important. Just because LiPo batteries don’t need conditioning in general, does NOT mean they dont have an ideal use / recharge environment. Anything can be abused even if it doesn’t need conditioning.
From Apple on batteries:
http://support.apple.com/kb/HT1446
http://www.apple.com/batteries/
Storing your MacBook
If you are going to store your MacBook away for an extended period of time, keep it in a cool location (room temperature roughly 22° C or about 72° F). Make certain you have at least a 50% charge on the internal battery of your Macbook if you plan on storing it away for a few months; recharge your battery to 50% or so every six months roughly if being stored away. If you live in a humid environment, keep your Macbook stored in its zippered case to prevent infiltration of humidity on the internals of your Macbook which could lead to corrosion.
Considerations:
Your battery is subject to chemical aging even if not in use. A Lithium battery is aging as soon as its made, regardless.
In a perfect (although impractical) situation, your lithium battery is best idealized swinging back and forth between 20 and 85% SOC (state of charge) roughly.
Further still how you discharge the battery is far more important than how it is either charged or stored short term, and more important long term that cycle counts.
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Keep your macbook plugged in when near a socket since in the near end of long-term life, this is beneficial to the battery.
Peace

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Ralph Landry1 wrote:
Works for me every time without failure.
It's not a matter of failure, it's the idea of training people to associate the Trash with unmounting a volume. The Trash is a mechanism for the permanent deletion of your data, and designed to appear as such. Apple haters used to laugh at this..."Eject by dragging to the Trash? And you say the Mac is intuitive? Ha ha ha..." And they were right. It's better to teach ways that actually make more sense.
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