Just like an ICE gas tank. 80 % full on an EV is 80% of total battery capacity.
ICE vehicles have different sized gas tanks. EVs have both different sized energy holding capacities they also have varying filling rates. When you charge to 80% it has got 80% of its total energy holding capacity.
When filling an ICE vehicle tank you slow down the fill rate or stop it automatically as it gets closer to full. On an EV the fill rate for EVs is variable and is controlled by the program in the car based on known battery variables and physics based principles.
For EVs the rate of energy flow into the battery is slowed at 80% for reasons of physics. If you do not need a full battery then filling to 80% is faster and cheaper if you are being charged for energy at a commercial location by the minute rather than kwh. If you charge at home this is not an issue since you only pay for the electric energy put into the battery.
Edited by Tony, 06 February 2025 - 04:54 PM.