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Stop Start systems don't really work on battery voltage, they work on internal resistance. Change to a lower resistance chemistry and the system will always think the battery is low. I did a LiFe swap on my Fiat and that was the end of Stop Start. Switched back to Pb and S/S came back immediately. Same goes for adding a super cap across the terminals. Incidentally, the workshop manuals are very clear about not connecting any device directly across the battery terminals.
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