You can find all the replacement parts and accessories you need for your Brompton at Escapa. Like the Brompton G-Line Greenway Battery Charger 2A EU for the 36V Li-Ion battery.
Technical Specifications.
Optional charger for the Brompton Electric G-Line
Input: 100–240 V AC, 50–60 Hz, 1.8 A max
Output: 42.0V DC 2.0A
Power cable with EU plug for wall outlet included.
Manufacturer: Greenway
This charger is not compatible with the battery of a Brompton C-Line and P-Line.