One of the problems with keeping our 6 volt batteries in good shape is that the original battery location on the Ford Model A is a real 'pisser'. The main goal/concern is about keeping it fully (but not overly) charged. That is easy enough to do. But what is also of great importance in battery health is proper water (electrolyte) level. And that is a bitch to adequately check on in a manner that would encourage frequent inspection and addition of water (distilled only): Carpet/rubber floor mat removal & wooden floor board removal. With their attendant peripherals of brake & shifter rubber 'boots', etc., getting to the actual battery is a time-consuming and 'hassle' intensive job.
Of course most of us take the 'short cut' of just pulling the mat/carpet back, lifting the 'Battery Inspection Plate', and then looking as best we can down into the 'cavity', hoping that we can do an "adequate" job of inspection. And for the most part that is just what we achieve - 'Adequate'. However, a much better job of getting to the battery can be done with the more laborious Floorboard removal. But either way, the main object is to check on the water (electrolyte) level of each of the three battery cells, because water lever is one of the most important aspects of battery life and performance.
One device that helps keep the battery's water from 'evaporating', misting, splashing, etc., (reducing water/electrolyte loss by 50%) is the "Water Miser" Safety Vent, by FLOW SYSTEMS. A great many people who live intimate lives with batteries use these 'recovery' caps to cut their water maintenance in half. If the battery is exposed for easy access then these caps are of only marginal value. However, if the battery is located in difficult to access location (under the floor-board) then these unique
"Water Miser" caps are worth investigating. It will cut your water loss in half and thereby reduce the hassle factor of thoroughly checking your battery water level (removing floor-board) in half. These special caps replace your original factory caps, and cost about $2.50 each. If you are having battery problems, these might be worth a look. The have a website:
www.FlowSystemsUSA.com
These unique water-recovery caps only work on 6 volt batteries, and 'old fashioned' 12 volt batteries that have the six-caps for filling water into the six individual battery cells. The won't work on today's conventional 'seal' batteries.