Charge time depends on how empty the pack is, how many amp-hours it holds, and how many amps the charger actually puts out. Anyone who quotes a single number for every cart is guessing.
Lead-acid
A golf cart charger tapers. It starts strong and finishes slowly, which is why “it was only driven two miles” can still mean several hours on the charger. From a real discharge, plan on leaving a flooded or AGM pack plugged in overnight. Let it finish. Pulling the plug because the cart “has enough to get to the corner” is how packs sulfate.
Lithium
A lithium charger can stay near its rated current for most of the charge. A 15 amp charger on a 105Ah battery is on the order of seven hours from empty, and less if you plugged in at half. Your kit’s charger and the battery’s amp-hours are the two numbers that matter. They are listed on the product page.
If the charger used to finish in four hours and now runs until morning, test the individual batteries before you blame the outlet. Shop chargers only when the chemistry matches. A lead-acid charger does not become a lithium charger because it still lights up.
