After all the threads on batteries, I thought I'd price out a new battery for my car. I found this name brand battery for my car, and it is quite inexpensive. They say the fitment works, but I'm not sure where the external vent would plug in...
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Maybe you have to buy a whole bunch and tape them together in series/parallel?

 

They got 'em for Porsche too under "consumer battery" rather than car battery - what the hell is a consumer battery?

 

Plugs into your bong. Plenty of time for smokin’, since your car isn’t going to start anyway. ​​​​​​​

 

its never the battery…