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Density, we talking power to weight or power to volume?
Batteries are always going to to score pretty horrible in both you will need several things to make a battery work.
A structure to make up the anode, cathode and electrolyte. Then that will go in some kind of cell container. Those cells will need conductors to to connect them together. Then those conductors and cells will need support structures to hold them in place. Putting it all in a water tight box is a pretty good idea. And should probably add a cooling system if you want it to last a long time.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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