The Car Charger 1.8A for B1 500 AirTTL from Profoto will charge the B1’s Lithium-ion battery from a car’s 12V (cigarette lighter) accessory outlet in 2 hours.
Profoto B-Series
Profoto Car Charger 1.8A for B1 and B2
Availability:
Available on back-order
$204.01 inc GST
Available on back-order
Rosco E Colour 5264 Venetian Blue 508mm x 610mm Sheet
Profoto Li-Ion Battery MK II for B1 & B1X 



