You can add others from Tom Tom website. Model number is 4PN60. Battery life is still good when unplugged from power.
TomTom Go Essential 620 4PN60 6 Inch Sat Nav - Fast Delivery
TOMTOM GO Professional 620 WIFI HGV Truck Bus 6" Sat UK EU Maps Live Traffic
TOMTOM GO Professional 620 WIFI HGV Truck Lorry Bus 6" Sat Nav Full Europe Maps
Hgv Truck Campervan Sat Nav TomTom Go Professional 620 Europe Map 6” GPS System
CELLONIC, Battery for Navigation, Compatible with Tomtom Go 600, 620 (2016), Ess
TomTom GO Essential navigation device - 5 inch, traffic jam prevention thanks to TomTom traffic, map updates Europe, updates via Wi-Fi (Renewed)
