An older style battery charger will not have bulk, absorption and float stages... and as such will generally run at a higher voltage than the battery requires when it is nearly fully charged... and doing so generates excess heat and boils off electrolyte in the case of wet-cells, and just fries the gel in gel cells and AGMs..
If he leaves an old-style battery charger connected for any significant period of time... which is necessary to get the batteries up to 100%, he runs a much higher risk of frying them if it isn't a smart charger.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.