Can they restore or rejuvenate extremely weak or junk batteries*?
They WILL NOT “fix” a battery with a shorted cell or other physical maladies such as vibration damage or loss of reactive material (lead) which (due to past excessive sulfation or vibration) has shed itself and now rests on the bottom of the battery case and thus is “shorting” out a cell. Make no mistake, while the cause of a shorted cell may have been excessive sulfation, except for disassembly and rebuilding the battery by a battery manufacture, there is no actual “fix” for a battery which has a shorted cell. It is imperative for you to determine if your battery has shorted cells prior to attempting to de-sulfate it and/or if a defective battery exists within a bank of batteries (such as a golf card). With that said, many batteries which have grown weak or thought to be “junk” and which simply won’t accept a charge etc., the answer is YES. Generally, electronic pulse de-sulfators seem to work 60 to 70%+ of the time on batteries which simply will no longer accept a charge. For reasons