Heart Rate Monitor Help asap please

AmandaMarie916

I say asap because I'm getting ready to go to the store. I have the Polar FT4, but am worried I'm not using it right or it's not working right. The other day when I was doing this tv workout it said I burned like 170 calories and now today same workout same pace it says I burned 364? Same thing when I was using it to play a game. 2 days ago it kept telling me that the watch and chest band weren't connecting with each other. Are the batteries going bad already? I've only had it less than 2 weeks. Is there any hrm's that you don't have to wear a band around your lower chest? This was highly recommended by a lot of people so what's going on here? I already returned one because there was like a bubble in the watch screen. I'm so frustrated. It worked great when I first got it and now I don't know.