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Message: <blockquote data-quote="alohart" data-source="post: 1506" data-attributes="member: 586">That's a good point, JoeS.  As you know, with the Insight, starting the ICE causes the IMA motor/generator to force-charge the IMA battery pack after the BMS has lost its charge level information.  The BMS can detect a fully-charged state within at most half an hour with the ICE running.In the i-MiEV, the charger would probably need to charge the Li-ion battery pack up to the point where its voltage would indicate that it's nearly fully charged before the BMS could determine the charge level.  That could take many hours (unless the BMS retains charge level information even with the 12 v. battery disconnected).I've been happy using a small 13 Ah Odyssey AGM battery in my Insight for several years.  Not only does it prevent corrosion, but it's considerably lighter since the smallest standard automotive-size FLA battery has a much larger capacity than is needed by a car that rarely uses its 12 v. starter motor.  I would think that the 12 v. needs of the i-MiEV would be minimal as well, so a small 12 v. AGM battery should suffice.  Is that a reasonable assumption?  What size is the 12 v. i-MiEV battery?</blockquote>