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I'm not an expert, however, I do have experience. Both AGM and GEL batteries should be charged at a lower rate than a regular lead acid battery. An older car such as a 1987 Porsche does not have the software to recognize the difference between a GEL/AGM and a lead acid battery so the alternator works overtime. It does not have the capability to adjust the charging rate per battery type and it overcharges the battery. I had this problem when I installed an AGM in my 2008 Porsche. There are an awful lot of owners who use GEL batteries in their older Porsches and never have a problem. I assume that this is because of the +/- tolerances of electrical systems.
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