What on earth is EDTA?
Pb is the symbol for lead on the periodic table. Your battery gets a certain amount of lead in its plates when it is new. Some of that dissolves into solution when you pour in the acid. Some of it turns into lead sulphate when things are not working quite right. (Adding EDTA prevents that.) If you allow the extra liquid to boil off the lead stays in the battery. The liquid does not actually boil in that it never gets that hot. It DOES electrolyze into hydrogen and oxygen and the vapours go away. Anyway, if the lead stays in the battery, you haven’t lost anything when the level draws down except for water, which you happily add back in (in the form of DISTILLED water). Removing electrolyte is not a good idea. There is Pb (lead) dissolved in the electrolyte and you’ll diminish the capacity of your battery by removing it. The battery on the F boils off electrolyte fast enough that it won’t be overfilled for long.
