Yes, you have two wear and tear items on the compression rod.
The bushing can be replaced, however the ball joint can not as it is part of the compression rod.
Depends what parts are not fitted, however I doubt if reconnecting the battery will cause any issues.
You do not say but I am guessing that you want it live so you can lock the car ?
Guess that it is not the brake fluid level then.
Check your brake and high level rear light.
Just do the simple checks first as a process of elimination.
Might be a plan to check the post cat sensors and sensor wiring and connectors since your comments suggest that the car may have been grounded on the ramp jacking beam.
Interested in this as I also find that Sky is silly money at circa £65.00 per month for the full package.
Been meaning to phone cancellations for months now and sort out a better deal.
However very interested in the options.
PS: Internet connection not the best as I live in the sticks and fibre optic is never going to happen.
Alex.