1. Nyobolt, a Cambridge-based electric vehicle battery startup, has unveiled a testing and demonstration car created with Callum Automotive. 2. The car is designed for low-volume production and showcases Nyobolt's advanced battery technology. 3. The battery can charge from 10% to 80% in 4 minutes 37 seconds using a 350kW fast charger, and offers a range of 155 miles on a full charge.