This optimiser is not running *ahem* optimally!
A battery optimiser is a charger you leave permanently connected, and it would be really handy for cars that drain their batteries during long diagnostic sessions. This one is dead even though the fuse is good, so I open it up to find out why. It takes 15 volts in and puts out 12 volts at 0.6 amps, and I have plenty of laptop supplies lying around if it comes to that.