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How old is the battery. Could be at the end of it's life. Is it hot were you live as it is here in Texas 104-107 will take a tole on older battery's. Also check to see that you'r altenator is not putting out to much voltage. Most auto part stores can run a free check for you. The acid you see is comming from a crack in the old battery. Must be replaced after checking out the system as I mentioned.