[RPCCS]

Spruce I’m going to buy a 12v leisure battery charger, it is 10amp and is suitable to start the battery on my start/stop van too.
Getting it from Amazon

You need a charger that is specific to charge an AGM battery if that's what your starter battery is. The label on the side of the battery will clearly say AGM if it is an AGM battery.

It's a different charger to charge a lead acid leisure battery. The Numax I linked to is only for lead acid leisure batteries as that was what we were talking about.

A more expensive 10amp CTEK battery charger has different modes to charge different battery types. The charger needs to be set to accommodate each battery type.

https://www.amazon.co.uk/CTEK-8-Stage-Battery-Charger-Conditioner/dp/B005O8YG44/ref=sr_1_6?crid=3Q5JB49YBVHKK&dib=eyJ2IjoiMSJ9.hV_He_EL3swBGnLc4ttqrsbxjE8XZ6v05-Sr3A9GjMngn36yVClIKDe9kjX2TiwISCMCp07TdydAoc6bruov6VVeFFHmKnkATin6eszmP_VHYypUzXMHaFOgBay8ECc7fITJnSnk5XSFa2LdijXZSlP5an-ZVe1u78XQBJof5fcDV3U2eNjNTPT6_cbfDqVAPFKf36CXjaXslREpvC3_PBkwUImmzAQ0EJ7cgIib5JeMF-XeCXAVxDBhVrMCBgOqE3uewHwMJqyY01vayZWPFC_PDMY8S8TjZQQafpNwDc4RxxVrLLW8oFNscBPo-lBCvk8Acj62YwGeq_CYsbvxkIPMiuNbTpX1tlIhiWyyAJj9s6kjwhUX3T5nvwosp-UK9VSEV4nmy18PnXJQpdj_7tsqIYT8WL9E8Z-Dl7SHqlgT84-umjr-F7OqDG4e2RUH.xbsVuLQ17bGHxqSH1c5OoUov8gZnLdYQO9WMFnv2FHc&dib_tag=se&keywords=ctek+10a+battery+charger&nsdOptOutParam=true&qid=1735224221&sprefix=ctek+10a+battery+charger%2Caps%2C103&sr=8-6&ufe=app_do%3Aamzn1.fos.23648568-4ba5-49f2-9aa6-31ae75f1e9cd

Spruce, thanks for your advice, it turns out that the battery charger I bought , is suitable for charging AGM batteries and 24v and a couple of other types of 12v.
I’ve got in set on AGM battery and see how it results. Many thanks to all other members who gave me advice too.😀😀