We recommend our “vented” batteries for in cabin installations like our ETX900-VNT to provide the highest level of safety.  In addition to the ETX900 safety features like over-discharge protection, short-circuit protection, over-voltage protection, and fault monitoring system; the ETX900-VNT has a thermal runaway containment and venting system.  https://earthxbatteries.com/product/etx900-vnt/