I confirm exactly the same problem at my EZBook 3 Pro v7.
Working about 1 hour till 50% and then shutdown. And the same high pitch sound when the charger is plugged or the screen brightness changed to low.
Currently I did the following but NOTHING still had helped:
- unlocked BIOS and tried changing different stuff related to battery
- fully discharged and charged the battery under both Windows or BIOS
- opened the hood (NOTE: warranty mark destroyed) and unplugged/plugged the battery
- installed Linux to SSD (M.2 128 Gb) and tried various tools there (upower shows reasonable data: capacity is 3800mA * 7.6V, consumption is 8-12W, so about 3-4 hours to run from 100% to 0% which is expected)
So if anyone solve this problem, please share the solution. BTW, if this is due to a battery issue then where I can buy the spare battery and how to replace it?
