For engine cranking you only want to run the batteries at about a 5C rate.
Chances are cranking a 4cyl engine with a 10ah battery will likely use between a 10C and 20C discharge rate. 20C is the absolute max on most LiFePO4 batteries.
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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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