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There are sealed (valve-regulated lead acid) AND unsealed. More and more are sealed, but just because the battery is inside the vehicle and not underhood does not guarantee that it is a sealed variant.
And even "maintenance free" sealed batteries are not the same. Many of them still have an active vent.
Since I do not hae my car yet, I cannot say what the car comes with.
The best way to prevent sparking is to minimize the electrical load upon connection. This may be kind of hard, but at least try to ensure that all lights, charging devices, etc are not present. Beyond that, it isnt good but it isnt bad for all practical purposes.
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