Yep.. yep....
Been there, done it....
Eight years ago I started small... and wasted a bit o money on tabletop charger(s), etc.
Folks here on the Forum straightened me out quickly... and I invested in first one, then two Wheeled Manual Chargers. (A Schumacher model that has been discontinued... arggggh!)
During last summer's perpetual Garage Clean-out Sale (in my front yard), I got rid of all the table top chargers... except ONE, that I kept, to actually charge lawn equipment batteries!
Now, I had to use the Wheeled Schumacher 10+ days ago to actually get the Mustang running again! (danged battery keeps going South, as soon as the temp drops to 32°, zero cranking amps,,,,,:( :( )