On Fri, Oct 1, 2010 at 6:18 PM, Michael Rasmussen <michael@jamhome.us>wrote:

>
> My concern is putting a battery under the rear passenger seat where
> a Propex heater is installed.
>

Then you'd be concerned about my rig, both Propex and Group 31 AGM aux
battery under the rear seat.  But I'm not.  First, there is no connection
between the combustion area of the Propex and the interior of the Vanagon.
Combustion air is drawn from the outside and  exhaust is to the outside.  No
way to ignite any battery fumes.  Second, with a sealed AGM battery there
are no gases being let out of the battery into the interior of the van.
Note here:  Sealed batteries like the AGM configuration DO have a vent that
will work under high pressure to hopefully stop a true explosion under those
conditions (that should never occur) that can occur with either a sustained
dead short or severe overcharging.

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