Lenovo Helix 1 - Primary Battery not communicating or charging.
Ignore the Yoga reference as the Helix is not listed on this site.
I have a Helix 1st Generation. I have obtained a genuine Lenovo battery to replace the primary battery in the tablet part. The keyboard battery is fine. The original battery is ok but only holding 2/3rds charge after 6 years. The new battery is recognised by Windows 10 as 0% and the Lenovo Diagnostics tool sees it but cannot communicate with it. This is the second battery it has not recognised. I have uninstalled the AC and battery drivers to no effect. I have checked the connections.