11-17-2017 09:45 AM
There is a battery draining bug in the latest (18.104.22.168) synaptics drivers. This is true in both the Windows 10 and Windows 7 drivers.
One of synaptics processes is pooling the WMI quite frequently using about 1% of the cpu, non-stop.
This has been fixed in the windows 10 drivers on the Yoga.
There is a detailed writeup on this here:
Reverting back to the 22.214.171.124 drivers fixes this, although they were quite hard to find for Windows 7.
Lenovo, please fix this.