Problem with battery

Hardware MKR Family MKRFOX1200
2

Hello,

After a lot of hours I could resolve the issue, it was because the code, you have to change the:

while (!Serial) {}

with

while (!Serial) {
  waiting++;
  if (waiting> 9) {
    debug = false;
    break;
  }

Before the Arduino was search of the Serial connection, and with the battery there is not that connection. With the new code it works good.