RE: Light bulb moment
If you find the Better Places video, I recall there was one scene with a battery on a yellow scissors-type trolley on wheels and (I assume) this would take the grunt out of locating and inserting the pack..... BUT, wouldn't you need two of them - to despatch the empty battery and install the replacement? Logistics apart, the least-worst option would really be to charge it, as it would take me around the recharge time simply to swap them over! Clearly, a swap dictated by capacity or battery fault conditions, not simply a lack of juice.
Still, a swap with the BT system was certainly faster than a Rapid charge!