I think you're just seeing the result of your battery "breathing". It's frm the little holes in the vent caps These keep the battery from exploding (by allowing pressure / gases to release) as it warms during charging / hot weather. It's normal. One thing to rememeber - this is battery acid, not just water! Watch yourself. Keep the battery reasonably clean and treat the terminals with terminal protector. This will keep corrosion to a minimum.
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Eagles may soar...but weasels don't get sucked into jet engines!