An advantage of hybrid cars is that they're partly powered by a petrol or diesel engine, so if your battery runs out of charge, it's not the end of the world. In mild hybrid and full hybrid models, the battery will automatically charge, using excess energy from the combustion engine, so you won't have to worry about using a charging point. If you have a plug-in hybrid car, you'll need to charge it once the battery is flat, otherwise you'll use a lot more fuel as your car will be lugging an empty battery pack around.