I always figured that batteries lost most of their fluid when bikes tipped over or you were cornering hard in a lean. I know that they bubble and 'boil' when they're fully charged and it makes sense that water leaves the battery in that manner. However, do they actually lose more water due to gravity and wrecks?
I have a half used up jug of 'battery acid' from Napa that I use to fill my batteries back up. I imagine it doesn't make much of a difference given I'm only adding maybe 5cc of fluid to each cell every year at most. I don't really have a problem with my batteries going dry either. I put battery tender pigtails on everything I own now because I got tired of buying new batteries in cold years when I was too lazy to disassemble them from all of my bikes. Now i just play battery tender roulette all winter long and it's been working well for me.
I have a half used up jug of 'battery acid' from Napa that I use to fill my batteries back up. I imagine it doesn't make much of a difference given I'm only adding maybe 5cc of fluid to each cell every year at most. I don't really have a problem with my batteries going dry either. I put battery tender pigtails on everything I own now because I got tired of buying new batteries in cold years when I was too lazy to disassemble them from all of my bikes. Now i just play battery tender roulette all winter long and it's been working well for me.