The Basemap is correct "worldwide autoroute DEM Basemap,NR 5.01" (latest)
Nuvi 1xxx do suffer from slow refresh sometimes.
Try to Reduce the number and size of maps in your Nuvi.(Make a smaller region)
If you have loaded a gmapdem.img remove it.
Reduce GPI Files (Large Custom POI files can slow down operation)
Delete unused Voices and Texts (Backup first)
The Charger issue is normal if you are not using a genuine Garmin Car Charger