OK, here's the conclusion after discussing this with my battery distributor (www.dcbattery.com). There are two brands of AGM battery; Lifeline and Optima. I have the former. The Lifelines can be used in any position, but only charged upright. The Optimas can be used or charged in any position at all. Unfortunately, I can't do a straight replacement because Optima doesn't make a battery as large as the ones I'm using. So it looks like I need to modify my hardware and calculations to turn them right side up, and hope they haven't been too degraded by losing about a cup of electrolite. There's no way to add electrolite back in. The end result of all this, besides the wasted time, is going to be a slightly smaller drop weight and slightly less space in the cabin. Alec
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