Backup battery and voltage indication

JF_Monier

I love flying!
Joined
Feb 3, 2018
Messages
7
Location
Vendée France West coast
With my SV HDX on B/U BATT only, the voltage indicator shows 33 or something corresponding to B/U BATT autonomy as explained on Dynon manuals.
But why is associated with warning : HIGH VOLTAGE. The actual voltage is close to 12,8VCC, so in the limits. Is there anything I've not understood ?

Thanks gents for you help and knowledge.
 
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