That is not what HPD means, from the manual:
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(HPD) High Pedal Detect: This function prevents unexpected vehicle movement if the key switch is turned ON after the accelerator is pressed, or the accelerator pedal is pressed when Forward/Reverse switch is used to change the direction of travel.
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The part You missed in the OP was the blinking light on the dash.
While there are several things that could cause the warning light to blink, the part about only happening the first time your turn the key on after being off for 2 days eliminates most of them.
If you then factor in that the batteries voltage and SG are normal, I think only leaves the possibility that it was caused by the OBC waking up.
I am guessing the charger was not plugged in.
Does anyone know how long it takes for the OBC to go into sleep mode if the cart is idle and disconnected from the charger?