[M100] Just got my 100

[me]

Excitedly, put off eating my sandwich to open my box. The T came in its 
pleasure carrying pouch. I ran upstairs to fetch fresh batteries, put 
them in , and got welcomed by a 'low battery' light. The display slowly 
fading.

Huh?

I brought it upstairs with me with four more fresh batteries to the same 
thing.

The screenshots on the ebay page showed the device working and the basic 
display. I thought it was safe. But, now, I have a device that I don't 
know where to start on fixing it.

Hints?