Yeah, no doubt about battery cable, negative cable was removed by hand, & battery cover was not fastened. Which brings me to the subject of charging your Slingshot when your battery goes bad.
There's no convenience access battery terminals in the trunk area. And you have to practically lay down to remove battery panel, and connect jumper cable terminals. Also four fasteners (two torx screws, & two push-in type) can be an inconvenience especially when no tools are near by. So install your own convenience terminals...
Get two battery cables' (red & black) and two 3/8" bolt & nuts' from store:
1. Drill four holes in the storage compartment (~1/2" drill bit).
a) two in the bottom corner
b) two for battery terminals (3/8" bolt) mounts.
2. Connect +/- battery cables to existing terminal wiring set.
3. Run both cables through storage compartment.
4. Fasten two bolts and nuts through compartment and secure to new battery cables.
And that is it. Keep in mind rear body moldings will have to be loosened to access storage compartment.
Hope this can save some headache (& backache) for Slingshot folks when you need a jumping, or to charge another vehicle.
P.S., If you're RECEIVING a jump ensure negative cable is attached to steel portion of vehicle, not the
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battery terminal.