My bad. sorry. I stated it wrong in the original post. ?Another different brand radio is receiving from FT-60 in another room. The audio coming out of this different brand radio is very weak. I can barely hear it. That is why I thought my FT-60 mic had issue. However, after recharging FT-60, the problem is gone.
I am doing testing again now. Try to see if I repeat the issue. right now, voltage is dropping to 7.4V after 12 hours and no issue with radio.
