I purchased brand new batteries for my 60V Vespa style scooter 3 months ago. I was getting 40km range. Everything was perfect. About a week ago I noticed my range dropped in half. Also before it would take 6 hours to fully charge batteries now it took 3 hours. I tested my charger it puts out 68.6 Volts. I took out all the batteries charge them to full and tested individually using load tester. First it shows 13.3V under loads it drops to 11V
I tested them right after I charged them, I just read that you have to wait 12 hours after charge to get accurate reading, is that true ?
Also what else can I do? I am thinking 1 battery is bad but how do I determine which one?