I wouldn't try to fill the battery with oil.
I did find some solid state refrigerator kits, pretty cheap. Might have to buy one and investigate their cooling power.
I'm think the 12v 72w units move less than 200 BTUs per hour.
I have a swamp cooler but it's going to go on the central A/C condenser as an evaporate cooler.
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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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