Replaced the battery on my B2710 last year, checked the fluid yesterday when I changed the oil. Fluid was at correct level, but had a funny color. It's a very opaque looking gray color, so I can't see the plates. One cell had what looks like small greyish colored flakes floating on the surface, kind of like if you poured talcum powder in there but it didn't dissolve, it just clumped into small flakes. Battery works fine, starting voltage is good, any idea what this is?