Here is a 3-prong off board charger adapter for the eZip Nano and Nano Carver. Currie calls this their "MIC-3-to-PnP adapter" and it is unique to their EZ2 Nano and EZ3 Nano Carver electric scooters.
This off board charging adapter from Currie Technologies connects to any 3-prong connector battery charger, allow you to charge your Nano's battery pack while off your scooter.