DELL PRECISION M4800 Battery Replacement

Hello friends, I'm DUDE.

I have a laptop "DELL PRECISION M4800" . I need a battery replacement ( ORIGINAL) and I couldn't find that anywhere, not even in an official Dell Service Centre. I'm out of warranty , so I'm not getting phone support, can you guys help me find an Original Battery Replacement?

My Laptop's Battery Specifications are : 97Wh , Standard Rechargeable Li-ion Battery, Type FJJ4W 11.1V .