Nissan Corp. 84 months limited warranty traps, Internet

I have Nissan installed a battery in 2008 in which the battery stated " 84 months Limited warranted and i understand that from the time of purchased the battery has a 100% replacement of 48 months or 4 years. Then the remaining months would be prorated and remember that the dealer (Gregoris Nissan) ery on the car. Issue now the garbage battery is to weak to start the car and I called the dealer to explain that and the dealer told me i have to bring the car so they can test to see if the battery or the alternator is the problem since this issue occur during the weekends i had put a spare battery from my other car on the nissan, the car starts and run through the entire weekend. I was able to drive the car to the dealer and the dealer wants me to pay another $53 to them to test their own brand junk battery then prorated after which will be either more than the actual cost of a brand new one. The battery is seating in the trunk of my car and they don't even support their product and think pple have to complaint to BBB about this so they can bring a lawsuit against Nissan for that particular issue.  Also pple  need to know not to buy Nissan battery because it is all nonesense. I think pple are better off buying car battery outside the dealers.