CR2032 coin cell batteries, the batteries that 4iiii powermeters and heart rate monitors operate on, that have a bitter coating, may present connection challenges.
On most batteries that come with the bitter coating, such as Duracell CR2032, the bitter coating is applied to the negative side of the battery. Test have shown that this coating is nonconductive and may result in connection or dropout issues with 4iiii powermeters.
Batteries with the bitter coating, are identified with the following symbol:
We advise to avoid using CR2032 batteries with the bitter coatings in 4iiii products.