Re: car batteries
https://www.racshop.co.uk/advice/what-is-an-agm-battery
Section from above link
The AGM battery is cheap to manufacture compared to other strategies used to help reduce carbon emissions, making vehicles more efficient and cleaner. AGM batteries offer a number of advantages over traditional lead batteries, including;
Less expensive – they can typically last up to two times longer
More reliable – greater tolerance to hot and cold temperatures
Greater performance – ideally suited for vehicles equipped with lots of electronic devices and accessories
Slower discharge whilst not in use
More durable – greater vibration resistance
Safer – no free-flowing electrolyte, therefore no spill hazard
More powerful – improved performance
AGM technology batteries can typically reduce C02 emissions by up to 8% more than traditional batteries
Vehicles fitted with AGM batteries must be re-coded whenever removed or replaced; therefore it is recommended this is done by a professional.
The whole article is worth a read