1989 EZ-Go Marathon Charging Question

[suttonsigep]

I just purchased my first golf cart last week, an 89 EZ-Go Marathon (36v). When I purchased it, it was not running. I replaced the batteries and solenoid, and it seems to be running fine now (a little slow, but I’ll worry about that later). My question is around charging though. As I said, this is my first cart so I’m still learning the best practices. The cart came with a Lester Electrical model 09611 charger. As far as I can tell, this charger will not automatically shut off when the batteries are at 100%. Is that correct? When should I charge my batteries and how do I know when they’re finished? I keep reading about leaving your cart on the charger all the time, but I gather that they have automatic chargers that maintain the charge. I will likely order one of those soon, but in the meantime, I would appreciate any tips.