370 Days left in warranty but told to buy new M1330 battery...

I love Dell, I own like 6 dell machines and we use them at work too. I have a XPS M1330 that I have Next Business Day, Includes Nights/Weekends warranty which was amazing in fixing the Graphics card issue. There's still 370 days left in my warranty.

However, last night, when I turned on my M1330, both windows and my bios tells me that my battery is not recognized. This is extremely weird since I was just using the battery on the plane ride back from LA... When I called support, all they did was tell me to buy a new one. Now I'm not so happy with dell :(

Can somebody help me here?

Thanks!