I have a 2008 Hybrid Tahoe with 142k miles on it, i bought it 4 years ago with about 40k miles on it. Just this past weekend I had an issue with it, causing the engine light to come on. I took it in to my local shop, which is also an independent certified hybrid shop. They came back and said that I needed a new hybrid battery. I've just had the normal wear and tear on it up to this point, though noticed no performance hits up to this point. Its going to cost me $4700 for the whole parts/labor. They are working with the local chevy dealer and getting a new battery delivered from Detroit. Their tests came back saying it had less than 50% life on it. Thought it was weird I didnt pick up on any power loss up to this point. I love this truck and want to keep for at least another 60k+ plus miles.