Battery Sulphation solution
Ahhhhh- battery reincarnation. Usually involving a trickle charge to "Break down the Sulfation". Well, my experience as a 30 year car mechanic with this technique is it is a waste of time, money,and hope ! Your better off to raise or lower your personal flag to half mast in your late batteries memory and achieve closure. Then take the dead electromotive lump to a suitable place of disposal, like a place that sells batteries, trade it in on a new one, and gather the new member of your crew to your chest. On second thought, don''t gather the battery to your chest without putting on a rubber apron. Seriously, it is a waste of time. You would be far better off to keep your batteries well maintained than to try and play "Battery Frankenstein" resurecting a dead-dead-dead unit.