I have a nitro 750 and I have noticed that my battery power gets drained pretty quick with the use of the console graph and i'll hear a low battery beep after a few hours. I am adding new electronics and LED lights from bluewater. Currently I have 2 deep cycle for trolling and a cranking. My thoughts are this. I should leave the cranking battery just for the motor and install a 4th battery for the an HDS 8, Elite 5, LEDS in compartments and deck, bilge and livewell pump. Just curious how others tie all this in and what is the best option.