If the cart does more than about 50 rounds a year, usually yes. A lithium pack costs two to three times a flooded set up front, gives roughly double the usable capacity and lasts several times as many cycles. Below that usage the payback stretches out and flooded stays rational.

In most cases yes, without changing the motor. You replace the pack, the charger and usually the battery tray, and you confirm the controller's voltage range. Older resistor carts need the controller and solenoid changed too, which is where conversions get expensive.

No watering, no equalising and no terminal cleaning routine. What you do need is a charger matched to the cell count, ventilation around the pack, and a habit of not charging the cart below freezing or leaving it at 100% for months.

Between 3,000 and 6,000 full cycles depending on chemistry, depth of discharge and temperature. For a cart doing 150 rounds a year that is well past a decade. The pack usually outlives the cart's second set of tires and often the cart itself.

It depends on the cart maker and the year. Many modern carts are sold with lithium options and accept a swap. Some older warranties require a dealer-installed pack. Check the cart's warranty terms before you cut anything, not after.