Hello there.

Recently my laptop's battery suddenly completely degraded and lost its capacity - within days, and, overnight, while charging, the battery case got unusually bigger and cracked. As you can see, it is unusable. As if the battery cells tore it apart. 

I do not consider it is safe to use it  again with a probably damaged battery cells inside.  To me it is not normal to spot something like this happening. I have owned many dells in the past, xps 1530, several e6530s & e6520s, 620, ... but I have never experienced  something like this.

I would like to hear from you regarding this matter. 

Thank you very much in advance.