About to charge my 9150 D/A Di2 for the first time on my new bike. Only a little over 500 miles but the red light is on when I check the charge. I have the SM-BCR1 charger, but it does not fit the junction box! The male connector does not appear to be the same as the female connection in the junction box. Am I doing something wrong? Do I need a different charger (SM-BCR1)?