Jo Ann,
Nah, it ain't like sewing. That's impossible!
It's all really simple.
Optima batteries are really good and cost a lot.
Old converters are not chargers.
Old converters can be noisy buzz boxes.
Old converters can overcharge batteries and can ruin them untimely.
Now there are better charger/converters.
Old converters still work, need to monitor.
New chargers are light, quiet, set and forget.
New chargers can be expensive
-Eddie-