E540 How to optimize a battery for lifespan?

I read this answer: https://forums.lenovo.com/t5/Welcome-FAQs-Knowledge-Base/How-can-I-increase-battery-life-ThinkPad/ta...
And I want to set up my battery for lifespan. But I can't find a Power Manager application anywhere in my Windows 8.1 system.
I also reviewed all available downloads for my laptop here http://support.lenovo.com/ua/uk/products/laptops-and-netbooks/thinkpad-edge-laptops/thinkpad-edge-e5...
but I didn't Power Manager application for Windows 8.1
Where can I find it?
My main question is: How to set up a battery for lifespan on my Lenovo ThinkPad E540 which is running on Windows 8.1?
Thanks in advance!
Solved!
Go to Solution.

https://thinkutils.wordpress.com/collection/power-manager/
Set the maximum to 90 or so.
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