I've got a BMW charger that came with my 07 x/country when I bought it last year.
It appears to work fine just plugged into the underseat socket on my 1200tu.
Steve
You know, Steve, I have one too but used on my HP2 Sport.... The only trouble is the OP wants to know about an Optimate, so our fascinating revelation is probably best kept to ourselves until another thread pops up
