Lenovo ideapad 320 15IKB, intel i5-8250U consumes more battery (almost double) on Linux compared to Windows 10 while performing similar tasks. I have tried updating the Kernel to latest version using Kernel Update Utility. The fan also spins a bit faster on normal use. System info is mentioned below:
durrani@ideapad:~$ neofetch
durrani@ideapad
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OS: Ubuntu 18.04.1 LTS x86_64
Host: 81BG Lenovo ideapad 320-15IKB
Kernel: 4.18.15-041815-generic
Uptime: 3 hours, 53 mins
Packages: 2514
Shell: bash 4.4.19
Resolution: 1920x1080
DE: KDE
WM: KWin
Theme: Breeze [KDE], Breeze [GTK3]
Icons: Breeze [KDE], Breeze [GTK3]
Terminal: konsole
Terminal Font: Hack 14
CPU: Intel i5-8250U (8) @ 3.400GHz
GPU: Intel UHD Graphics 620
Memory: 1793MiB / 11790MiB
durrani@ideapad:~$ dmesg | grep microcode
[ 1.755292] microcode: sig=0x806ea, pf=0x80, revision=0x96
[ 1.755487] microcode: Microcode Update Driver: v2.2.