The E-bike requires little more maintenance than a normal bicycle. Cleaning and oiling, keeping chains, cables and wiring properly adjusted and attached - the normal stuff!
The obvious difference is that you have to charge the battery, which can be done with the battery in the bike or with the battery removed and charged at another location. The charger is a 120 volt, much like a computer power supply. The connection to the battery is polarized (can only be connected one way), so it is quick, clean and most of all... easy!