I have a 2016 FLTRU. Has been on battery tender. Went to ride today with key fob in pocket and it required me to enter my pin. Did that, rode off, shut it off to get gas and restart....nothing but flashing turn signal lights. Wouldn't allow me to enter pin. Eventually, I was able to ket it started by entering my PIN. Got home, tried the 2nd key fob. This time it asked for my pin but after 10 seconds the I was allowed to start the bike normally without the PIN. What gives? Battery?