Steve - it's no riddle!   Only the water evaporates.  The acid components
remain at the same concentration - so as long as you keep adding DISTILLED
water, all of the concentration ratios should remain constant....

Think about evaporating seawater, the salt always stays behind!
-CC

        -----Original Message-----
        From:   Steve Gill [SMTP:[EMAIL PROTECTED]]
        Sent:   Monday, April 03, 2000 10:43 AM
        To:     V-MAX TECH LIST
        Subject:        Battery Top Up

        Hi All

        A riddle for you to ponder.  If I keep topping up my
        batteries (both car and bike) with distilled water how
        come I don't end up with severely diluted acid?  Is it
        worth saving the acid from old batteries to use when
        topping up?  What do you think and what do you do?  
        I would have thought that topping up with battery acid
        is better than water but I have been told it could
        result in too high a concentration of acid in my
        battery.  Most of the time I'm too lazy to use the
        hydrometer.

        Cheers

        Steve

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