Q: rMBP (late 2012) runs very slowly, only while plugged in and has cross in battery indicator
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Oct 29, 2015 6:44 PMby alex_h1,HelpfulHello uttamo,
I understand that you're seeing a X show up on your battery icon. Let's see if we can sort that out.
I would start with taking a look at the article below. It will details what and why you are seeing the X give Some troubleshooting involved like resetting the SMC, and then going into further about batteries on your MacBook Pro.
OS X Yosemite: If an X appears on the battery icon in the menu bar
https://support.apple.com/kb/PH18598
Resetting the System Management Controller (SMC) on your Mac
https://support.apple.com/en-us/HT201295
About Mac notebook batteries
https://support.apple.com/en-us/HT204054
Take care -
Oct 30, 2015 7:16 AMby norm123,Hey uttamo,
It was not problem with assist and glad we could help.
I also noticed that you said that your MacBook Pro was running slow. That could be one of many things, like a process that is using to much CPU or that you are using up most of your Ram. Here are a few things to look at to figure that part out as well.
OS X Yosemite: If your Mac runs slowly
https://support.apple.com/kb/PH19031
Use Activity Monitor on your Mac
https://support.apple.com/en-us/HT201464
Take it easy
