desertsubaru Posted June 13, 2015 Share Posted June 13, 2015 (edited) 2003 Forester I am pretty sure there is not a difference but when I looked at batteries on line at Auto zone some say in the description for Manual trans. Anybody have some input on this? Edited June 13, 2015 by desertsubaru Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 13, 2015 Share Posted June 13, 2015 Auto trans cars use a higher amp battery because there is more electrical load on the battery and alternator due to the electronics associated with the automagic trans. (Trans control unit, valve body solenoids, etc) You don't want to put the lower amp rated battery for manual trans in an auto trans car. 1 Quote Link to comment Share on other sites More sharing options...
desertsubaru Posted June 13, 2015 Author Share Posted June 13, 2015 Auto trans cars use a higher amp battery because there is more electrical load on the battery and alternator due to the electronics associated with the automagic trans. (Trans control unit, valve body solenoids, etc) You don't want to put the lower amp rated battery for manual trans in an auto trans car. So what should the minimum crank amps be? Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 13, 2015 Share Posted June 13, 2015 There's no specified minimum that I can find. Typically the difference in cranking amps is about 50-75 amps. Ex. 475 for manual, 550 for auto. This can vary between battery manufacturers. The FSM does specify base capacity of 48Ah for manual, 52Ah for automatic cars. Battery size numbers 55D23L, and 75D23L respectively. But I haven't found any cross-reference for those numbers yet. Quote Link to comment Share on other sites More sharing options...
Olnick Posted June 13, 2015 Share Posted June 13, 2015 So is there any advantage to using an "automatic" battery--with higher CCA--in a "manual" car? Quote Link to comment Share on other sites More sharing options...
naru Posted June 13, 2015 Share Posted June 13, 2015 Auto trans cars use a higher amp battery because there is more electrical load on the battery and alternator due to the electronics associated with the automagic trans. (Trans control unit, valve body solenoids, etc) You don't want to put the lower amp rated battery for manual trans in an auto trans car Nah,That is not the correct reason at all. Automatics need a bigger battery because the starter needs to turn the torque converter et all. Same reason the automatics use a gear reduction starter and the manuals don`t. 1 Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 13, 2015 Share Posted June 13, 2015 Both use a reduction drive as far as I know. Newer starters use a planetary reduction where the older ones were ring gear and pinion type. Converter is heavier, and the trans pump is driven as well. Valid point there. Quote Link to comment Share on other sites More sharing options...
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