To increase your laptop life is important to reduce cpu temperature. Temperature reduction CPU is possible setting cpu governor scaling to POWERSAVE.
The first thing I do after a system installation of Linux Mint 18 Sarah (Cinnamon-Mate-XFCE-KDE) is configure CPU governor to powersave and set it at system boot with systemd.
Install cpupower utility:
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$ sudo apt-get install linux-tools-common linux-tools-$(uname -r)
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$ cpupower -c all frequency-info
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$ sudo cpupower -c all frequency-set -g powersave
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$ cpupower -c all frequency-info
Create systemd service file to set CPU governor to powersave at system boot:
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$ cat << EOF | sudo tee /etc/systemd/system/cpupower.service
[Unit]
Description=CPU powersave
[Service]
Type=oneshot
ExecStart=/usr/bin/cpupower -c all frequency-set -g powersave
[Install]
WantedBy=multi-user.target
EOF
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$ sudo systemctl daemon-reload
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$ sudo systemctl enable cpupower.service
If you want to speed up your laptop and reduce his life, change your governor to PERFORMANCE with the same procedure changing powersave to performance.
PS.: Remember this is not valid LinuxMint 17.3 and previous versions, cause of systemd init system.