change battery 348 spider

Most 348s did not come with a jack (there may have been some 348s with a factory spare option but AFAIK they weren't sold in the US) and you wouldn't really want to trust that jack anyway. Use a floor jack or a lift. The jacking points are shown in at least one thread here and I think they're in the manual as well. You don't need to raise the car far enough to accommodate a standard jack stand so use some lumber for backup in case the jack fails.

 

This is for a 355 but the 348 is similar.
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LOL, that's pretty funny. When I bought my 348 Spider, I got a primer for the car from the seller, so I never had to learn this lesson. Looking at the repair kit in the trunk, you'd see the mobility kit of the package, which is a bottle of goop that is supposed to provide a patch and reinflation in a pinch. Laughable.

Regarding the battery, you need a floor jack placed under the left front jacking point. It's looks like a double wall steel edge. Loosen lug bolts first then jack up the car to remove the front wheel. Turn the wheels to the right to give you more access. Remove the panel in front of the wheel, in the wheel well, below the headlight. It's a bit finicky to remove and be careful with the fiberglass panel below the battery because it can break. This is a good time to inspect and repair the battery mounting clamps if they look rusted/eroded.