Long story short, I have two batteries, 1 walmart battery that is 2 years old with a 3 year warranty, and 1 xs power d680 in the back. My car is starting, but having a lot of trouble doing so. I would next to guarantee that the walmart battery is dead and the d680 is taking over the role, but I am at my moms house with no tools or anything to check voltage. Does anyone know how good the walmart replacement plan is? Also does anyone think this could be something else? As soon as it starts up, which it does each time, it fires right up and my alt has no problem taking over....help?