Bought a slightly used 2011 EZGO Cart and found out tonight it has a battery watering system by Trojan that I had never seen before. Didn't know how to check the water level or how to fill the batteries. Searched on net and found there are 3 ways to fill the batteries. Was just wondering which system people who have the system recommend using? This is all new to me and want to get the best system for the job. Thanks.