In Europe I would normally recommend one brand local to my region: https://melex.com.pl/en/products/passenger-street-legal https://melex.com.pl/en/products/pas

In Europe I would normally recommend one brand local to my region: https://melex.com.pl/en/products/passenger-street-legal https://melex.com.pl/en/products/passenger-street-legal They have dealerships in most of the EU: https://melex.com.pl/en/distribution https://melex.com.pl/en/distribution But they are somewhat low-tech with their deep-cycle lead-acid batteries.