Is my battery genuine?

I just bought a new battery for my Dell Vostro 3550, but the laptop says the battery is not genuine. The Dell part number does not seem to match the battery, so is it genuine. The battery does fit into the Vostro but says it won't charge as not genuine, but it does say Dell stamped on the battery. The sticker say:

CN-0V48RM-50046-0CS-007N-X12

Made in China

KC2012.01

DP/N 0V48RM

Thanks