15 R3, motherboard MK-BL meaning inquiry

Hi guys, few days ago I bought a battery replacement for my alienware 15 r3, and I changed it by myself. The new battery is working fine but unfortunately I just broke a small flat cable which is marked as MK-BL, just besides the battery connector. This flat cable is pretty thin, and half of it was torn. Currently the laptop is working fine, I can still use it to post this thread, but could any pro master tell me what the MK-BL stands for, not sure if this situation will harm the laptop if I continue using it. 

Thanks for the help.