I need to buy a new starter battery. But I've no idea which to get.
I've got a fairly basic 12v set up, with 4 × 12v wet domestic batteries charged by their own alternator, and a 12v wet starter battery with its own separate alternator.
Looking on Midland Swindlers website they've got sealed starter batteries, wet lead starter batteries, 2 different brands, some with 2 terminals, some at £60 and some at £85. I don't know what's best to get, or whether I should go for a different brand from somewhere else? https://www.midlandchandlers.co.uk/search?query=Starter+battery
(Having just had a chat with a chap from a nearby boatyard, he's made buying a starter battery sound very complicated and expensive (£125) and that it takes up to a month to order one in. Midland Swindlers have them in stock ready to dispatch, but boatyard guy said their batteries are rubbish (I paraphrase). He wouldn't tell me what brand battery it would likely be for £125, so I felt a bit fobbed off.)
Any starter battery buying advice, please?