Confirmation that these test cars are running an electric drivetrain comes with the fact no engine noise was heard by photographers. Additionally, a photo of the GLC’s nose with the bonnet open shows its lack of engine and there's no condensation or smoke from the car’s tailpipes. Final proof comes with an orange window sticker displaying an electricity lightning symbol (shown in the gallery).
The cars were spotted running with large battery packs, thought to be lithium ion. Mercedes has previously stated that its future models would be capable of travelling up to 310 miles between recharging.