Continuing from here: https://www.qashqaiforums.co.uk/viewtopic.php?f=29&t=8995
Maxwell is a US manufacturer that Elon Musk (Tesla) now owns. These I believe are likely the best quality Capacitors. Much China junk out there....no surprise.
Automotive Start-Stop
By 2025, U.S.-made vehicles must average 54.5 miles per gallon.
Automotive leaders build with our solutions.
Geely/Volvo
General Motors
Lamborghini
Continental AG
PSA
https://www.maxwell.com/solutions/transportation/auto/start-stop-micro-hybrid
https://ir.tesla.com/news-releases/news-release-details/tesla-completes-acquisition-maxwell-technologies
Construction...Note the amount of Carbon.
There is a flat pack version which may be within the Starter Jumper Packs we see on the market
Schematic construction of a Wound Supercapacitor
1. terminals, 2. safety vent, 3. sealing disc, 4. aluminum can, 5. positive pole, 6. separator, 7. carbon electrode, 8. collector, 9. carbon electrode, 10. negative pole