I constantly have problems with my battery because it discharges very fast. This problem only occurs in elementary OS. In Windows 8 the management of the battery is much better. I have already installed the battery management application from the AppCenter, but the battery still has the same problem. My laptop is a Lenovo Z40/70. Thank you.
I would recommend installing TLP which will help conserve battery power.
sudo add-apt-repository -y ppa:linrunner/tlp
sudo apt update
sudo apt install -y tlp tlp-rdw
sudo tlp start
Though if you haven't yet set elementary up to install from PPAs, run the following command first:
sudo apt install -y software-properties-common python3-software-properties python-software-properties