You may find this interesting.
Used by those that want to power the bullet cameras from the bike battery rather than rely on batteries which may fail just when you need them most!
A lot of people hard wire equipment to the bike battery, however, this will, over a period of time destroy the bullet cameras as whilst they have a tolerance of 8-15volts, they require a regulated voltage and not 'spiked power'.
The regulated 12V Power Supply Unit (PSU) is very compact, measuring just 8.5 (L) x 5.5 (W) x 2.5cm (H) and comes complete with an on/off switch & led light.
The cable length from the unit to the battery terminal is appro 1m, with one of the dc plug outlets also 1m, and the rest approximately 20cm, to enable the unit to be placed in many locations, e.g. or for the motorcyclist, under the rear seat.
Please note: Connecting a bullet camera to your vehicle battery may result in 'noise/ interference' on the video footage. The PSU purely regulates the power to stop damage to the bullet camera and will not magically get rid of any interference. (Though we are working on it!) Some motorbikes produce the interference due to the ignition spikes, other bikes do not. Unfortunately we cannot be held responsible for any interference caused by connecting the cameras to the bike battery, though we will do everything we can to try and help / offer a part credit if you wish to return the item.
Tip: If you do experience any interference on the video, try using a ferrite around the Av leads of the camcorder. Most camcorders are supplied with these they usually just snap on the av cable. This solution will also be substantially cheaper.
They offer a regulated PSU for £75 which seems expensive but should remove any worries about breaking your system.
You may want to think about using a rechargeable battery pack to remove any possibility of supply noise/spikes. RFI may still be a concern so a suitably placed ferrite will help.