Retina MacBook Pro Battery Percentage issue.

Hi,
I got a 2.3Ghz Retina MacBook Pro and have noticed that the battery indicator tells me (currently) I have 75% charge remaining. However, when I look into iStat widget, it tells me it's 72%.
I ran into System Inormation under 'Power' tab and divided the total capacity by the one left and it does come out to 72% indicating that the iStat is indeed correct.
Does anyone else have a similar problem? I just find it quite weird. I had to exchange the laptop once for batch of bad pixels on the screen. I really don't want to go to the store again and deal with setting up a new device if it's just a software glitch and not a battery issue.
Thanks,
Paul
ALSO,
I've checked the display for ghosting etc and no issues here. I've noticed that some of you have that problem. Just wanted to give an update on another rMBP.

I'd start with http://www.apple.com/batteries/notebooks.html

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I have the same late 2013 retina laptop.
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I don't use the Calendar however I noticed three services were all using more CPU than any others; Calendar Agent, AddressBookSourceSync and Openvpn-service.
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Apple has outside suppliers for most parts. Battery makers mass-produce, and errors occur.
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Hello, raikun.
Thank you for the question. The first thing we need to look at is the health and condition of your battery. This first article will show you how to process this. Be sure to test the results after each troubleshooting step processed.
Mac notebooks: Determining battery cycle count
http://support.apple.com/kb/HT1519
If the battery health shows acceptable, then try a reset of the System Management Controller. If the battery health shows to be unacceptable, reach out to use here.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
I would also recommend taking a look at the article below to help maximize battery life.
Mac notebooks: All about batteries
http://support.apple.com/kb/ht1446
Cheers,
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James
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Ciao.

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I am getting around 3-5 hours of battery life with my late 2013 rMBP with brightness turned down, bluetooth off, Wi-Fi on, forcing integrated GPU, and using safari w/out flash.
I've seen other people with the early 2013 model get 10 hours!
I used migration assistant to transfer my data across to this mac when I started using it a few weeks ago.
I have included a screenshot showing my current usage.
http://take.ms/TMw6b
My relevant specs:
ME294LL/A - 2.3ghz i7 w/ GeForce GT 750m.
Any solution other than fresh install?

Hello, raikun.
Thank you for the question. The first thing we need to look at is the health and condition of your battery. This first article will show you how to process this. Be sure to test the results after each troubleshooting step processed.
Mac notebooks: Determining battery cycle count
http://support.apple.com/kb/HT1519
If the battery health shows acceptable, then try a reset of the System Management Controller. If the battery health shows to be unacceptable, reach out to use here.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
I would also recommend taking a look at the article below to help maximize battery life.
Mac notebooks: All about batteries
http://support.apple.com/kb/ht1446
Cheers,
Jason H.

Does OS X Mavericks shorten a battery life time in Retina Macbook Pro?

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Try resetting the SMC. If that doesn't work, take it to the Genius Bar. You're under warranty.
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http://support.apple.com/kb/ht3964

Retina MacBook Pro Battery Percentage issue.

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