These are pricey but for any of you guys looks to save weight these would be great. My buddy bought one for his sons super cup car and I couldn't believe it, when you pick it up you would think its an empty display battery. The one I have pictured will start up to a 2200cc engine and weighs 3.2 lbs, the biggest one they offer will start a 5000cc engine or a 5.7 liter and weighs 5 lbs. Here's a link to their website: http://antigravitybatteries.com/?page_id=994

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When in doubt, Hit the Gas!!!!!!!

My build, http://www.woodsbuggy.com/index.php?opt ... =23&t=9147

Lithium?

You can get lithium packs now as small as your cell phone that'll start a big diesel!