"They don't sell this kind of battery or charger at the auto parts store or make them for bikes or cars." wrong, it's called a Ctek Pony has three different ones in stock. all of which say specific for wet, sealed, agm, dry cell, calcium, and gel. i own two of these chargers. bettery tender also sells a charger specific for the true gel battery. the only real diffrence is the charging speed, you want low amps and longer time to charge the battery, which is why you don't want to use a normal style car charger.