You do realise that in the time taken for that pee stop you can boost the car considerably? Depending on the charging capabilities the time take to walk to the loo and back could be enough for a 100 mile boost.
Ah but, any stop/s are in a layby or side of the road given my journeys are mostly country roads on the the odd occasion I need one ?
On a more series note, my biggest concern is getting to my parents in one fowl swoop, at speed should the need arise.