My car has a 55D23R battery rated for 356 cold cranking amps (CCA) as recommended by the manufacturer. I installed a Blackvue DR750S-2CH dashcam which has a parking mode. The parking mode allows the camera to stay on and record video based on motion or vibration. The camera will shut itself off once the battery voltage drops below 12.0V. After a few weeks of using this camera, I've noticed that the battery can't keep the camera on for more than a few minutes after parking (initially it could go for approximately 12 hours).
Will replacing the battery with a deep-cycle battery help? Will a higher CCA rating help? I'm looking for a battery that will keep my camera running without degrading the battery quickly.
Edit: My battery's charge capacity is 48Ah. Average power consumption of the camera in parking mode is 300mA (3.6W at 12V).
I'd like to clarify the timeline since my original post was a bit vague. I installed the camera in July 2018 (2 years ago). In the first 2-3 months, the battery slowly degraded until the camera couldn't be powered for more than a few minutes while parked. I stopped using the parking feature and the battery has lasted fine until this month when I've noticed it's not holding a charge well. I plan to replace the battery very soon and would like to start using my dashcam in parking mode again.