Should I Run off AC or Battery for max battery life?

I've read so many different theories on extending your battery life, I was wondering what is the most optimal setup to ensure a long battery life:
1) If I'm using my laptop at home on a desk, is it better to keep my laptop plugged into the AC battery charger even at 100%? (i.e. Will the battery know to stop charging and will my laptop just be running off the AC current or will it constantly be overcharging my battery and draining the lifecycle)?
Thanks for any help here.
Product: 2.5 GHz Intel Core i7 MacBook Pro (Retina, 15-inch, Mid 2014)
OS: OS X Yosemite (10.10.1)

Also, I did check apples site but didn't find this answer here: http://www.apple.com/batteries/maximizing-performance/
This website lead me to believe it's better to run off AC, but it's not written by apple, so not sure if it's accurate: http://www.quora.com/Will-running-my-MacBook-Air-while-plugged-in-improve-its-ba ttery-life

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When I use my 5 year old MBP on battery it suddenly shuts off when the battery life reaches 88%. Anyone know why and how to fix it?

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Model Information:
Manufacturer:          Sony
Device Name:          ASMB012
Pack Lot Code:          1
PCB Lot Code:          0
Firmware Version:          110
Hardware Revision:          500
Cell Revision:          303
Charge Information:
Charge Remaining (mAh):          4108
Fully Charged:          Yes
Charging:          No
Full Charge Capacity (mAh):          4200
Health Information:
Cycle Count:          40
Condition:          Service Battery
Battery Installed:          Yes
Amperage (mA):          0
Voltage (mV):          12361

Is it bad for the Macbook to run off AC without battery installed?

just wondering, because I'm waiting for a new battery, and the bottom feels hot even when well-ventilated.
-thanks.
Ted.

Ted Starr wrote:
just wondering, because I'm waiting for a new battery, and the bottom feels hot even when well-ventilated.
The heat has nothing to do with the battery installed or not installed. See the following link
Apple Notebooks: Operating Temperatures
As mentioned in the other post the two main problems running with out a battery is processor speed halved and the possibility of losing your work if you have a power outage or the magsafe falls off.
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Model Information:
Serial Number:          9G015053UDN5A
Manufacturer:          DP
Device Name:          bq20z951
Pack Lot Code:          0
PCB Lot Code:          0
Firmware Version:          301
Hardware Revision:          1
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Should I Run off AC or Battery for max battery life?

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