Heart rate monitor?

I'll be honest, I don't have that watch, but I did have one of the cheaper ones and one of their duos. Both severely overestimated calorie burns. So both got sent back and I ended up with this:

http://www.amazon.com/gp/product/B006QP0R2E/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

have you checked to make sure the company put the battery in correctly? (sometimes they can end up back wards)