Latitude E5470 - Battery 5% not charging
I have a Dell Latitude E5470. It is 13 months old. I'm experiencing a very annoying problem. During the last weeks, as soon as I turn on the PC, the battery led starts flashing orange, very rapidly. Once I'm in Win10, the battery icon reports that the battery charge is 5%, but it is not charging. If I try to turn on the PC without the power supply, it doesn't start at all, as any battery is pugged in.
I tried several solutions I read and found on the forum (remove/add the Microsoft ACPI, turn off the PC and remove the battery, update the BIOS, etc.) but none of these succeded.
The BIOS says that the battery is plugged in, but there is a "communication error" so that the status of the battery cannot be identified, whilst the power supply is correctly identified (it reports "90W"). The ePSA diagnosis ends up with an "ePSA 4300-19 - Alert" that says: "Battery - The battery is not installed" and "Error code: 2000-0131".
Honestly I'm running out of ideas other than send the PC to the assistance: that means tens of days of inactivity...