Macbook Pro about 2012 won't start with out power lead in and runs very very slow Maverick OS

Macbook Pro about 2012 won't start with out power lead in and runs very very slow Maverick OS?

Take each of these steps as needed, and check to make sure it hasn't been fixed with a reboot afterwards before trying the next step.
Backup your data if you haven't already:
https://discussions.apple.com/docs/DOC-1992
If you use Airplay, see https://discussions.apple.com/docs/DOC-6831
If you don't use Airplay, be sure to upgrade to 10.9.2, using this update:
http://support.apple.com/kb/DL1726
Make sure your hard drive is not over 85% full.
Make sure Spotlight is not indexing.
Make sure Time Machine is not running when you do other tasks.
Check to make sure you have not accidently/purposefully installed MacKeeper, as it will slow down your Mac:
https://discussions.apple.com/docs/DOC-3036
Remove any other system cache cleaning applications.
Reset the SMC:
http://support.apple.com/kb/ht3964
Reset the PRAM:
http://support.apple.com/kb/ht1379
Check to make sure there aren't any signs the power adapter might be damaged, or the wrong one*:
http://www.macmaps.com/frayguide.html
If there are still issues, you may need to replace the battery:
https://www.apple.com/batteries/replacements.html

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