EP500 Pro connected to B300

Hi all,

I recently acquired an EP 500 Pro and an B300, I managed to connect both by pressing for 3 seconds long at B300 to connect to the EP500 Pro however there is an issue the B300 depleted all the power feeding the EP500Pro. Now comes the question. If I buy an AC charger and I recharge the B300 will I need to mannualy press the 2 seconds button to start sharing the power with the EP500 Pro? Or Will the B300 memorize the function previously activated and automatically start feeding the EP500 Pro when it needs?