Can an error in battery cause a slow CPUS and the fan to run non-stop?

tthe battery need serviced but my computer runs slow and the fan is running non-stop. MacBook Pro 13" purchased around 2011.

OK, you really need to dump that Windows attitude quickly, because what worked over there is completely useless here.  I never understood the "upgrade didn't work obviously, because this or that happened, so how do I downgrade."  I hang out around here, and I haven't seen many comments about fans running full blast after the updates. I did them, and nothing happened.
First, you can't downgrade the firmware EFI update.  I think if you tried, it would brick your MBP.
You could reinstall Lion if you wanted, but that's really a pain, and once again, one of those Windows things that people always do that wastes time.  A security update and Remote Desktop Client (which only runs if you start it up) would not effect your fan speed.
Apple does have "restore points", but it's a real backup system that requires a backup drive.  It's called Time Machine and it's preinstalled on your Mac, easy to use, and allows you to go as far back in time on your Mac as the size of your backup drive will allow.
Now, after all that, let's try to figure out what's going on with your fans.  First, did you do the EFI update correctly?  Meaning did you do it when the MBP was actually plugged into the wall?  What are you running?  Games?  Videos?  Something else?

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              MacBook Pro - model: MacBookPro9,2
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