Niall at the risk of bombarding you with recommendations this is the battery and brand I recommend having used them on cars and boats for a decade or two. It's the usual maintenance free (sealed calcium) lead/acid. AGM batteries are the gel ones but not really needed unless you have a stop/start car. Click on image link for source and delivered (usually within 24 hours) price.

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This smart charger has all the facilities a typical Ctek has including a plug-in harness that can be permanently wired to battery, but half the price or less. Has AGM, lead/acid, summer and winter modes plus auto sensing for 6 or 12 volt batteries.

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Being a Yorkshireman I'm always looking for quality allied to price. Perhaps it shows innocent


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone