My car is an Opel Corsa B.
Recently, it started having trouble to start.
When I turn on the key, the car behaves like the battery is empty (slow cranking -low choking sound- of the engine and the lights become much dimmer than usual) but after a few seconds the cranking sound becomes gradually normal (louder) and the car eventually starts.
It still starts from the first try though but it always seems like the battery is empty at first.
I have been told it is a dying battery, but then why would it gradually start, wouldn't be other way around, gradually coming to a stop ?