Charge 2 unable to track cardio accurately?

[Fluegemd]

So I’m wondering if it’s my charge 2 or all charge 2’s that have this problem. It never can accurately pick up my heart rate when I’m doing cardio. I have tried different tightness levels on the band, various positions on my wrist/arm, and switching between my dominant and non-dominant hand. The charge will either display a hyphen, meaning it’s not able to register at all, or it will be wildly inaccurate. In a high intensity spin class it barely puts me at a “cardio” reading, even when my heart is beating out of my chest. Wondering if it’s my Fitbit or all fitbits that experience this as I am looking for something that can accurately track my work outs.

[bntracker]

I have the same problem with my Charge 2. Heart rate seems to work ok when I'm not exercising, But if I look at it while exercising often it will not show any heart rate, or it will say 170 when I'm doing a moderate hike (I'm 71 yr old)  or 96 when I know I'm exercising aerobically. I don't know whether to believe it when it reads 120 or 130 (which could be accurate, but who knows?)

[DMcCoy]

This exact problem makes me want to throw this thing in the garage. It’s supposed to be a fitness tracker, and can do everything but that. Extremely frustrating, to say the least. I guess I’ll have to try another brand next time.