My charger cord is just a black extension cord with rubber block heater cap on the end. One side is EBH, the other is charger. The gap in the grill is wider toward the center and seems to hold them well by selecting a horizonal position with the right grip. There are windup "cord reels" which have black 105C rated cords, and I just harvested the cord replacing it with a cheap 60C cord. The 105C cord is routed through a grommet in the firewall.
It seems convenient to plug both in at the grille, I like it so far. My hope is plugging it at a random parking lot (I spotted a few stores with outlets), people will assume it's a block heater. Kill-a-watt says my Enginer charger uses just over 1000 watts, dropping to 300W after a cell hits 3.6V and the charger "shuts off". That seems wasteful to me. I plan to set up a pair of X10 switches to toggle from charger to EBH at some fixed time in the middle of the night.
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