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yep it works but have to be REAL careful about the hydrogen gas situation .. Years before trying the welder method (and only on weak batteries that don't have shorted plates) , I used to do a 5 or 10-minute high-amp charge to see if the weak cell(s) would start to clear themselves out .. Sometimes a battery would desulfate itself and recover , at which point I would dump it , flush it several times to get any loose matter out, and then new acid .. I had about a 60% success rate .. The welder method, with a lot of patience, can recover most "clogged" batteries.. Another thing we have done is drain and dry them inverted for months, tap them to get the flakes out, flush many times, and new acid .. That works sometimes too .. But overall I find it more convenient to go to certain junkyards and buy batts for $40ea , some of these places have 1-year free replacement guarantee , some places have life replacement .. Remember, two enemies of lead/acid batts are Physical Shock (internal/external damage) and Time (sulfation)
Loved the video, one of the few videos that don’t talk about the weather, other stupid stuff.
I have had good success using mains 120v through diodes to make a rectifier, then use air-conditioning capacitors in series to the load to work as current limiters, different microfarads pass different current, usually charge at about one or two amps...when first connected the battery will be seeing high voltage spikes but, as it starts to take a charge, that rapidly drops as it comes back to life...Obviously working with mains you have to know what you are doing but it is doable if just a little unorthodox...
