That means your current battery voltage is 66.5V.
The battery should be 60V, fully charged after unplugging the charger for a period of time, the full voltage is about 67V, the summer is high, the winter is low, you should be fully charged.
Lithium batteries can be broadly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium-ion batteries do not contain lithium in the metallic state and are rechargeable. The fifth generation of rechargeable batteries, lithium metal batteries, was born in 1996, and its safety, specific capacity, self-discharge rate and performance-to-price ratio are better than lithium-ion batteries.
First look at the accuracy of your table is not accurate, generally speaking, the single cell voltage can not exceed 2.5v, more than the life of the battery has an impact, if the charger cutoff voltage is too high, you can in the charging socket inside the forward series diode, a diode voltage drop is 0.7v
Normal, if less than 53V is not normal, normal electric vehicle fully charged after the battery voltage is higher than the actual voltage, the voltage will gradually decrease after riding
A, when the trolley is fully charged, it shows 66 volts, indicating that your battery is new, and it is normal for a new battery rated at 60 volts to get 66 volts when fully charged.