Would you store gas and batteries in the same box?

i just bought what I think is a fabulous rear carrier with plans of putting my gas tank and two batteries that run my electric bike into it.
Now as I sat down I started to think about having a gas tank in a sealed plastic box along with 24 volt sealed bats. it would sure solve all my build issues for $33.
Dumb idea?
Canadian Tire

I'd shy away from the idea, Toy.
It's one of those things that you could probably get away with for a long time and be perfectly safe but...it only takes one thing to go wrong and you could get hurt or at the least start a fire where you'd least want it. Think of it this way: The box is sealed, or at least with little to no ventilation, and a wire connection comes loose from a battery, causes a spark... See what I mean?

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Age and Treachery Will Always Triumph
Over Youth and Skill

99% of the time, no problem...but what happens in that 1% chances is enough to have me looking for another solution.

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29/10ths cubic inches of raw power.
HoughMade at WIRED.com: http://www.wired.com/cars/coolwheels...memade_bicycle

Yeah, I don't think I'd do that.

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http://www.jasonhight.net/videos/mot...etowork-sm.wmv

That's what I figured. It's OK, I'll just use it for the batteries, I just wanted to save having to get a custom gas tank made. I really like the looks of this carrier and it will act like a rear fender. I'm tired of slush hitting the back of my head!