If anybody's looking for a handy way to stow their convenience charger between uses, here's my solution. I bought a plastic electrical junction box and used a steel L-bracket to hang it from the exterior wall, next to the sliding window where I access the indoor wall plug. A common Y-bracket finishes it off. The box is hung from the bracket with the open end down. The charger hangs from the Y-bracket, remaining under the box for weather protection.
It only takes a second to hang up the cord now. Best of all, the three parts cost me under $20! Has anybody found a better solution for an outdoor parking space?