To get to the battery, brake master cylinder & gearbox filler on my 1930 Sunbeam 16hp, peel back carpet, undo dzus fastener on toe board & remove, undo catches on floor board & remove, simples.
I'm keeping my battery staggering on with a Battery Fighter conditioner I won from MOG Mag. The Varta lead acid is 19 years old & considering there is no voltage regulation just a cutout & on/off charge switch it has a hard life. I do always use an isolator switch on stopping. Quality pays dividends.
Tim