Battery Health on UX305c

[trvlnoma]

System: UX305c, Win10
Battery or AC: AC
Model:
Frequency of occurrence: Always
Reset OS:
Screenshot or video:
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My UX305c has just started charging very, very slowly, about 3% per hour with the OS shutdown. Its currently on about 40%.
I am pretty sure its not an issue with the charger, have tried another similar charger and see same problem. At ASUS's advice I installed MyASUS, however found it it does not offer a Battery Health Check on my model, worthless ! How can I determine if the problem is in the battery or circuitry managing the charging process ?
The charging policy, set using Windows tools is mid scale, between Max Battery Life and Perfomance.
Liz

[Blake_ASUS]

Hi there,
Even though the capacity is not 100% accurate, it still shows that there is a gap between the design and full charge.
Please disconnect all the cable from the device and long press power button for 40 second to reboot the device.
It would clear CMOS.
If this doesn't help, please kindly send the device to our service center.
Thank you.