When a standard car battery is charged via the alternator, it creates hydrogen gas.
In standard cars, that battery is under the hood so the gas drifts away.
In the Smart, the gas could accumulate in the cabin causing an explosion hazard.
The standard Smart battery comes with a venting tube that exits the bottom of the battery tray, your replacement should have this connection unless using a sealed Optima battery.
If you'd like to go all out and do the whole car then....
Complete Leather Interior Upgrade Kit
Complete Kit includes upgrades for both seats (pictured first), both door panels and the upper and lower dash pieces (air-bag safe as well).
Com...
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