How does the button battery look positive and negative?
Button battery to check the positive and negative methods: see marked, the top is often no indication, the bottom of the "+" symbol positive.
Button battery to check the positive and negative methods: visual, the top is more rounded, is the negative, the bottom is relatively flat, is the cathode.
There is a word that side is positive, the front is generally slightly larger than the back a little bit, the opposite is generally a circle, it is easy to distinguish, positive is positive.
