I think I fixed my 2018 starter by installing a more powerful 240 CCA battery yesterday. I bought the Antigravity ATZ7-8 Lithium battery that Gasgas recommends to fix the starting problems for the 2018 and 2019 250 and 300s.
Yes that is the 8 cell battery. It only takes 4 cells connected in series to provide the 13.6 volts you see out of these batteries so I believe they must have connected half of these cells in parallel to provide twice the cranking current and battery energy storage capacity. Seems to be a good idea.
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