In my bank of 8 batteries, one has some sort of crude in it. Each cell has what looks to be dust or powder, for a lack of a better word, floating in it. The SG reading for each cell is about 1.25, about the same as the other batteries. The batteries are 12 volt, 140 amphr, and fluid levels are correct. The batteries are only about a month or so old. Any idea as to what this is, and is the battery going bad? Thanks, BEAR