On 21 Jul 2020 22:12:20 +0100 (BST), Theo
wrote:

I think I might need a new car battery charger. However I'm failing to find
anything suitable and wonder if the team can recommend any models.

Requirement #1 is to be able to charge flat batteries.
My boot lid sometimes doesn't latch properly and leaves a dim little light
on - which if you don't drive for a week or two empties the battery.

Angle grinder to remove the boot lid, duct tape to insulate the bare cables.

Even buying both new should work out cheaper than a new battery charger.

Or fix / replace the switch

--