Repco Jumpstarter advice needed

[Olive]

if its this one 
https://www.repco.co.nz/globes-batteries...p/A1336634

the manual is here
https://www.repco.com.au/medias/sys_mast...ual-A5.pdf

If the on/off switch doesnt do it I would have thought another two options are to replace/remove the battery or put it in a suitcase wrapped up in multiple layers of anything until it goes flat

Thanks.   I've unplugged it and taken it out to the garden shed, where it can beep away until it goes flat.  I didn't feel comfortable leaving it plugged in all night when it's clearly faulty.  The beeping might even scare off some of the rats that live there.