There are grease fittings right near the top of the tube, perhaps some grease just got a bit hot during storage and leaked out some. Or, someone put in some really thin grease and it's just oozing out and landing on the battery box. Only thing I can think of.
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2015 Four Winds Super C, Class C Motorhome
4 - 100w mono solar panels with MPPT40 to charge four 6v batteries with 440amp hours.
Progressive Industries HW50c surge protector
1800 / 3600 inverter with auto transfer switch,
The bosses: My wife and two Labradoddles 80 lbs each
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