Optimiser which one.

[pawl]

Thanks for the great advice . Oxford optimiser on its way .

[Rusty Nuts]

Did you know the bike in your avatar is reversed?

[philthunder]

Freddyfruitbat. That looks like it can be left on all the time, it is microprocessor controlled so it should only put a charge in, when it is needed. If you have a voltmeter you can check the part charge and the full charge voltages. Should not go above 13.5 volts

[Robotstar5]

I've been using Optimates for probably 20 years, some bikes have had one connected for up to 6 months without any problems, haven't had a battery fail yet, but did have an Optimate fail after 15 years