Production of the Porsche 718 series electric models, Cayman coupe, and Boxster convertible, may be delayed due to battery issues.Porsche's plans for the upcoming '983' generation are behind schedule, with battery-related complications causing headaches.The battery placement in the middle of the vehicle has led to adjustments being requested from battery-maker Valmet Automotive.Delays could result in the electric 718 arriving after the current petrol-powered models are phased out, potentially in 2026 or 2027.