Starter problems with large engines

Hello colleagues, on time for Faak I finished my bike. Well, I don’t lose any words about the snow on the passes around Faak anymore! For this we were rewarded last year with a week 30 degrees and almost 2000km around Faak. Now my problem (or not). If I drive short distance and need between 5-6 times the starter buttons, I have most of the bad luck that the battery runs out of breath the seventh time. Is this normal, or is the charging system (Lima from Spyke 32A) z u weak. It is a 124″ S&S, IST-Züdung and 1.4KW starter. I would be very grateful for opinions.