[clacktronics]

...um it kind of looks like the LiPo battery was on the border of exploding, its pretty swolen... boom lost an arm.

edit: ah translated from website

"Then, however, turned to biochemical engineer of the team during a routine examination determined possible deformations in the battery casing. As Tim told me recently in Berlin, it suddenly looked like this, as could a Feared by some nightmare scenario actually occur: If the burst chip battery or, where there is a cut in the Silikonverkapselung, could have fatal consequences."