Do we top off these Yuasa brand batteries with water or what? I searched the internet far and wide for the answer to this battery question to no avail. I've got an '07 with stock battery with the 6 yellow removable caps covering each cell. I'm sure we keep these leveled off right? I already added to equal them all up anyhow so... if not then what? Anyway, there's just a red line on the side of the battery and it doesn't say anything like "fill line" or anything, I assumed it was a fill line and filled all cells up to just under that line. How in the vast interwebs is there no info available for this battery maintenance info?