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I'm considering replacing my batteries with a 100 AH 12.6V LIFeP04.

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The few I examined thus far can support 100 A draw.? ?I hear the original starter drew 65A spinning the air-cooled engine.? ? ?At $150ish, seems far better than an agm or conventional lead-acid.

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I suspect that it's harder to spin the ej22 and wonder what the current draw is.??

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Also, I suspect that my subaru alternator has sufficient voltage capacity to charge it to ~80%.? ?

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I'm also tempted to add a 12V heater and (thermostat) so that the battery will charge in the winter.??

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Thoughts?(

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Thanks, Eric

Eric- I have made this mistake myself. I burned up an alt doing this. LI batts pull too much power when charging for a starting batt. Todd's reply is correct-it can burn up your alt unless the batt has a Batt Management System. Most modern LI batts do, but there are several issues, still. The BMS also limits discharge, which means it may not allow enough?current to the starter to start the car. This is to prevent a batt fire. Also the BMS can fail without warning, possibly resulting?in a fire. Its far safer to use LI batts just as house batts, where current?draw is lower. Its also best to use a secondary system to control currents, such as a Renology. It's far safer to use an AGM or lead-acid for starting batt. I'm running a three batt system-an AGM for starting and two LI for the camper through a Renology.