On 10/04/2020 20:28, Bert Coules wrote:

I don't have any instructions: should I just attach the clamps and
switch on?

Yes. Don't mix + and -.

Do I need to disconnect the car's own connecting leads
first?

No.


And how can I tell when the battery is sufficiently charged?

Because it will be tomorrow. In other words, just leave it overnight.
Don't worry.

Bill

Many thanks.