Lots of people have mounted batteries where the spare tire is located and can comment on that specific location. I mounted four Battery Born 100Ahr batteries under the slider doorway step. They are mounted on their side to stay above frame rails. This location is closer to van alternator and driver seat for electrical connections and has worked out very well. I monitor battery, outside and exhaust temps and the batteries have have always stayed well within their operating temp range with ambient temps from -5 to 112F. From my experience leading battery cell manufacturing engineering at Tesla, these batteries will outperform lead acid batteries outside and is a fine option to save space inside as well keep CG lower.
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Owned a 2007 Sprinter poptop and now For Sale 2016 170" 4x4 overlander with durable cabinets, hot water with collapsible shower, sink, toilet, air compressors, electrically raising queen bed, four+ bike garage, rotating two person passenger bench, suspension, rack, skid plates, lights & more. Build out videos at www.vantripping.com and https://www.youtube.com/@vantripping
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