The day I discovered this, I didn’t have the
intention of saving battery, I just wanted to reduce
my CPU temperature. I noticed that my CPU over
heats so I searched for a solution. It resulted to
the discovery of my battery’s solution.
Go to control panel, and then locate power
options.
Another way to get to power options is by right
clicking on your battery icon at the bottom of
your taskbar then choosing power options.
In power options, select “Power Saver” then at the
right, locate “Change plan setting” and click on it.
You will see few options at this level e.g. “Turn of
Display”, “Put the computer to sleep”.
We will tamper/play with/alter “On battery”
options only.
For “turn off display”, choose 2 minutes,
For “Put the computer to sleep”, choose 10
minutes, in the drop down and for plan brightness,
move the slider to the extreme left.
To advance, click “change advanced power
settings” skip everything and go to processor
management.
Minimum Processor State
On battery: 5%
Plugged in: 5%
System Cooling Policy
On battery: Passive
Plugged in: Passive
Maximum Processor State
On battery: 40%
Plugged in: 50%

Read more with detailed screenshots : http://techgyst.com/2016/08/13/learn-how-to-manage-your-old-battery-in-three-steps/