Yes I bought the battery. It’s very high quality, anodised aluminium case, extremely well machined and assembled, looks like something Apple has made. The connection plugs all snap together with precision. Came supplied with lots of accessories for fitting. I have located mine in a storage compartment under the boot floor ( bmw x1 u11) and plugged it into the cigarette type power feed in the boot. It works seemlessly, the cameras move into park mode when the car is locked, when I open the car door the viofo informs me that it is recording.
A great buy, wish I could say the same about the viofo which is stupidly locking every parking file. Just read in this site that I need to contact viofo for different firmware, it’s really not a patch on my old vicovation which has given stellar performance, wish they hadn’t moved out of the dashcam market!