I have my A139 hardwired with voltage cutoff at 12.2v, this only really gives me 6-8 hours of parking footage.
I've researched a couple of different options, i.e. buying a blackvue battery pack, but it's far too expensive.
I have a 14ah sealed lead acid lying around, and I decided to put it in my car's boot and tap it into an accessory fuse. The dashcam then feeds directly from the second battery. The battery charges while driving and is isolated from the main battery (I think / hope) through the accessory fuse.
Question is, it's so simple, but is it safe? I have heard of people installing battery isolators, but I don't think it's necessary?
I am having some problems getting the dashcams third wire (yellow accessory) to activate the parking mode, and I'm not sure whats going wrong with this.
I have this yellow wire tapped into a different accessory fuse, but it doesn't seem to be activating the parking mode. (It was working before when I didn't have this second battery fuse). I wonder is the second battery providing power to ALL accessory fuses, and thus the parking wire cannot detect engine shutoff... Any simple way around that?
I've researched a couple of different options, i.e. buying a blackvue battery pack, but it's far too expensive.
I have a 14ah sealed lead acid lying around, and I decided to put it in my car's boot and tap it into an accessory fuse. The dashcam then feeds directly from the second battery. The battery charges while driving and is isolated from the main battery (I think / hope) through the accessory fuse.
Question is, it's so simple, but is it safe? I have heard of people installing battery isolators, but I don't think it's necessary?
I am having some problems getting the dashcams third wire (yellow accessory) to activate the parking mode, and I'm not sure whats going wrong with this.
I have this yellow wire tapped into a different accessory fuse, but it doesn't seem to be activating the parking mode. (It was working before when I didn't have this second battery fuse). I wonder is the second battery providing power to ALL accessory fuses, and thus the parking wire cannot detect engine shutoff... Any simple way around that?