I would say either your cam is bad or the 100's are junk (although I have never tried it). If you had it on a scrape, it should have had plenty of time to trigger. I have the 200 and put it over scrapes and have gottendozens of pics, and the battery lasts a long time. Here are some pics
http://www.huntingnet.com/forum/tm.aspx?m=1822626&mpage=1&key=&#182262 6