You can find all the replacement parts and components you need for your e-bike at Escapa.
Such as the Yamaha Charger (2016 and later) X942-943 (External Battery)
Features:
Compatible with Yamaha batteries from 36 to 42 volts,
Input: 220–240 V, AC, 50–60 Hz, 1.3 A,
Output: 42V, DC, 4A,
Housing: 18.5 cm x 8.7 cm x 5.0 cm,
Power cord length: 150 cm /
Connection cable length: 120 cm,
Weight: 880 g.