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Do anyone know if a post exists of adding a second battery. I know once you install a RAISS or SSRI intake you have space over the PCM to add a battery, I'm just not sure what all needs to be done to make this work
 

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Unless your putting an extreme sound system in your car why would you want 2 batteries?
 

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The battery tray is symmetric and mounts to the inner fender, so you can do just like the diesel trucks of the same era did and put in another tray on the left side, however you will have to re-locate the PCM as there isn't enough height for a 78 series battery. You can probably just rotate the PCM from horizontal to vertical, but will need to figure out a way to fasten it down securely. If running dual batteries, it's highly recommended that they be the same size, manufacturer, and age unless you're running battery isolators and all that jazz.

A 65 series battery will (barely) fit in the stock location if you modify the battery tray - this can deliver incrementally more power, reserve, etc

They have Lithium Ion batteries in automotive sizes that, depending on your application, might be a solution?

As buickman1 asked - what is the motivation for 2 batteries?
 

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Just use the dual battery trays from the 80s diesel B/C/D body cars. Plastic tray in mom's 84 Cadillac, they will fit right in our cars, but you may have to drill mounting holes. Relocate PCM if needed.
 

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Keep the PCM away from a battery. The fumes will eat it.
 

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Yet my dual battery C/K pickup has PCM right up against battery for over 20 years now.
Sounds like some unsupported urban legend to me.
 

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Yet my dual battery C/K pickup has PCM right up against battery for over 20 years now.
Sounds like some unsupported urban legend to me.
The battery acid eats the battery tray, and the wheelhouse, so I still would not mount them near each other.
 

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Yet my dual battery C/K pickup has PCM right up against battery for over 20 years now.
Sounds like some unsupported urban legend to me.
Is the C/K pickup's pcm painted black, or is it bare aluminum?

'Battery in the right rear of the trunk's popularity is waning …
 

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None of these mods are for everyone ,or even the average enthusiast. Probably the easiest weight to redistribute. In my car it also provides super stable voltage/ground to the fuel pump. In my truck moving batteries to cabin moved significant weight toward rear by over seven feet. If mod doesn't interest you ,then you probably shouldn't do it. It's not as if underhood temps do batteries any favor either.

200107
 

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No offense to what your doing with weight distribution, but I would buy or make some kind of sealed battery box and run a vent to the outside of the cabin.
 

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According to Odyssey these AGM batteries produce no gas. No liquid,and no lead plates
 
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