You should avoid deleting the unknown files to store your personal files and folders because if you delete that files it may be critical position with computer.
Never add tap water to your battery. ... Battery electrolyte levels should be just below the bottom of the vent well, about ½ - ¾ inch above the tops of the separators. Never let the electrolyte level to drop below the top of the plates.
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=b2 b3-b4 or something close to that, I hope this helps ^^
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