I never said they did. But they did decide to put it in this car. They also decided to put in a sub-par Bluetooth system that failed the first day I had it (literally the first day. It spent it's first week in the shop and they had no idea what was wrong. I am the one who demanded that they replace the Bluetooth system and they finally did - problem solved). I'm pretty sure they don't manufacture that either. Does that mean they are not responsible for the quality of it? I bought a car. A complete car. Not a battery and not a car without a battery. As far as I am concerned, everything from bumper to bumper in this car is Infiniti and is subject to their quality control and their responsibility. Did they make the brakes? How about the shocks? The bearings? The rims or lug nuts? The stereo? Maybe the cameras? How about the key locks. Or the RF chips that go in the remotes? No, but they are still responsible for them and the quality of them. When I buy a $65000 car (MSRP), I expect $65000 quality. Infiniti lacks the quality I expect. It may be fine for you, but I guess I just set my expectations too high.Pretty sure Infiniti doesn't manufacture the battery.