Why does the dashcam battery not hold a charge?

[EstherFitz]

The reason the dashcam battery does not hold a charge is that the built-in battery of the dashcam is very small, with a capacity of only a few hundred milliamperes. When the vehicle is parked and in detection mode, the built-in battery typically lasts only about 20 hours. Different brands of dashcams have varying battery capacities, and the battery life depends on the dashcam's battery capacity. There are two power supply methods for dashcams: one is powered through the cigarette lighter, where the dashcam uses its own lithium battery to record for a period after the vehicle is turned off before shutting down; the other method involves connecting the dashcam to the car battery and ACC power supply, where the battery provides power, and the ACC is only used for power detection—the dashcam stops working when the ACC is cut off. Some brand dashcams can be manually controlled, allowing the owner to shut off power based on recording time.