Second I buy Powerball (first passed away after 3 years of loyal service) and this one works perfectly ... except the counter that simply refused to come on. Because in the worst case I could retrieve the counter of the former, I resolved to disassemble to get to the bottom: Batteries ok but failed system, probably on the side of the screen, or the screen-board connection (I tested the rest).
It would be interesting that Amazon will contact his supplier in order to test the products before sending ...