Walk/Run Pedometer

I really like this pedometer I've been buying it for years...however after about 2 or 3 weeks, I notice it started "losing" steps and my steps were NOT counted correctly. I know this because I walk the same route every day and sometimes I'm "over-the-limit" and other times I'm far below.I'm wondering if the battery is losing power. I'm going to buy a new battery for it and see if this is the problem..

I had two issues that caused me to throw this pedometer away. First, it was extremely difficult to set up. The slightest button press jumped me beyond the step I wanted. Second, once I thought I had it set up correctly, I found the belt clip would NOT keep the pedometer attached to my belt. This is definitely an inferior product compared to the Sportline pedometer I had previously.