[TomH]

This sounds like absolute nonsense to me. You can't be expected to nurse a PHEV battery like that.


What does the handbook say?

 

[TomH]

L

Two observations from the following that I found in the digital manual for my GTE.
1. ‘Avoid complete discharge’. This is unavoidable with a PHEV. On all longer journeys it’s inevitable that the of battery will be depleted by journeys end and there is no way to stop this happening.
2. There is no ‘Timer-controlled charging’ (another topic).

Charging instructions

• For everyday use, set the upper battery charge limit to 80% in the Infotainment system Battery charge limits or activate Battery Care Mode.
• Do not charge the high-voltage battery after every journey if only a short distance has been driven in purely electric mode, but charge only when necessary.
• Plan charging processes for a later departure time with the departure times in the Infotainment system Timer-controlled charging. At low ambient temperatures, this optimises the temperature of the high-voltage battery and improves performance.
• Charge the high-voltage battery when the charge level is below 20%. Avoid complete discharge of the high-voltage battery if possible →
  .
• If you fully charge the high-voltage battery, you should drive off shortly afterwards if possible – or plan charging with a departure time in the Infotainment system Timer-controlled charging.
• Avoid frequent charging with direct current (DC
  ) in everyday life.

Looks like some idiot has transposed the battery care section from the BEV handbook into the GTE handbook.

There was nothing like that in the handbook for my Mk 7.5 GTE. It served us well for three and a half years without detectable battery degradation. And it certainly had none of that impossible cosseting.

I sincerely hope that they haven't "increased" the battery size by reducing the protective top and bottom buffers, leaving you with a vulnerable battery in normal use.