On my onboard charger, it says my deep cycle is full charged, and that my cranking battery needs charged. This is after having it continuously plugged in for a couple of days. I noticed this after my trim would not work. I used an external battery charger on the cranking battery and now it’s charged enough to use trim. I live up north, and it’s to cold to get the boat out. Would the cranking battery be low as a result of my outboard not being ran in a couple of weeks, or does my onboard charger have an issue?