For some weeks I noticed whenever I want to start my car (Nissan Primera 2000) it takes a few seconds more to start than the usual turn-the-key-and-voila-ignition. And sometimes it won't start at first try (no cranking and very dim lights), but after waiting for like a minute, I would start.
Now it's not even starting on its own anymore and but when I connect another battery it starts normally in the turn-the-key-and-voila-ignition way.
I suspect the battery has gone bad but the only question I have is this battery is still showing green in the indicator window (if it has gone bad, I believe it shouldn't be green).
And I know the alternator is working fine because when I used another battery to start the car and put my battery back and drove the car for about 1 hour, it started fine. However, when the car sat for about 4 hours it couldn't start on it own again.
So is the battery bad or something else could be wrong? I don't want to buy another battery only to discover it wasn't a battery problem.