Lowrance LVR 250 VHF radio problem

Hi. Recently got a "new" boat. It came with the radio. Couldn't understand why my battery keeps running flat after a short time even when not in use. I checked everything is off but still running flat. Finally with testing i figured out the radio is pulling full power when its switched off. Has anyone got a idea why and how its possible that its still on when its off.
Thanks
 
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