My third Banner gave up 2.5 years ago. Local factors found my latest one. Its a couple of mm taller than the Banner but it fits with no mods. Given the fact the leads are now nearer the bonnet I have used a strip of cage protector over the tops of the terminals.
Battery is: NUMAX CXT GOLD, 896CXT, 32Ah, 390A.
Think it is meant for a ride on lawn mower so the chaps in the shop tell me. From what I remember it cost me about £40, 2.5 years ago.