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Message: <blockquote data-quote="adulbrich" data-source="post: 8515713" data-attributes="member: 661255">Yes, they're sealed. They are AGM batteries.They're safe for interior because they don't vent hydrogen gas during normal charging. However, they will vent if you overcharge them (so they don't explode).Vehicles with batteries inside the cab have vent tubes that lead outside the car in case batteries vent (even if they are AGM)Most people in car audio just leave them in the trunk without a vent tube though. It's not the "right" thing to do, but most people do it anyways and if you don't vent your batteries you'll be fine</blockquote>

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