I called XS Power today because the D6500 I have under the hood(about a year old) is really swollen. Doesn't seem to be affecting performance, but I'm concerned from a safety standpoint. I was told that swelling isn't covered under warranty because that usually means there's a ton of resistance inside the battery and it wasn't maintained properly. What I really want to know is, what did I do wrong in maintaining the battery? It's the only battery in my setup, it has been fed by a DC 270xp the whole time... I have about 2200 wrms in my system, and no other aftermarket electrical. I drive the truck every day, I charge high 14's cold and mid 14's when warm, hardly ever wang on it except for an occasional demo, and I never run any electrical with the engine off. Thinking about it, I would be fine with an auto zone battery but, i took faith in the product and Nate was super helpful during the shopping process.