In most industrialized countries, a phaseout of TEL from road vehicle fuels was completed by the early 2000s because of concerns over air and soil lead levels and the accumulative neurotoxicity of lead.
Do not use tap water. Tap water contains minerals that are harmful to golf cart batteries. Distilled water will extend the life of your batteries. 4. Put on gloves and goggles for protection before removing the plastic caps. Remember the cells are filled with acid. A handy battery filler is the Plews Automatic Shut-Off battery filler.
Depending on how much the golf cart batteries are discharged will determine how long it will take to fully recharge them. You can certainly run your batteries down to 80% or so if you are using it for several rounds of golf or for a long trip on your golf cart but this may shorten the life of your batteries. Avoid deep discharging whenever possible. Be sure to charge the batteries fully after every use.