The battery slowly loses its charge when a vehicle sits idle – not least because the high-tech computers in today’s cars are always on, even when the engine is switched off. During the coronavirus lockdown, it should be enough to simply start the car every 3-4 days to prevent battery drain. Take your vehicle out occasionally (only if lockdown restrictions allow) for a short drive (at least 5-10 minutes) to recharge the battery and allow the engine oil and coolant to circulate.
For EVs:beware of standby power drain
While electric vehicles (EVs) require much less maintenance than vehicles with internal combustion engines (ICEs), they are not entirely maintenance-free. Your electric vehicle can lose some of its range after sitting idle for just a week. It is important to keep your EV's battery at a proper state of charge. Most battery experts recommend keeping the charge at somewhere between 40% and 80% when the vehicle is left unused for a prolonged period.