[scottyb]

Trojan says "opportunity charging" is good when the use cycle exceeds the battery capacity. Like putting the cart on the charger while you eat lunch.
When the cart is plugged in the charger will output maximum amperage initially. This is the bulk phase of a multi-phased algorithm. This bulk charge is very effective at replenishing lost amperage quickly (usually 30-40 minutes). It is not a substitution for a complete charge but, it will extend your use.
Always plug the cart on for a complete charge when done.