Chris I dont doubt they work but at £70+ they only do what a switch such as www.demon-tweeks.co.uk/motorsport/batter...isolator-switch will do. With a bit of ingenuity could be placed reachable from the cockpit. I have never found the need for one even when car stand for over 2 weeks providing the battery is well charged. Tim
Agreed, a manual cut-out switch will do the job but the Battery Brain will also monitor the voltage and cut out if it drops below 11.8 volts - so you don't need to disconnect the battery every time. When the engine's running the auto cut-off is disabled so the car will keep running if the volts drop further.
Mine's been left for over 5 weeks and with the immobiliser could have run low so it's a safety net rather than a necessity.
