Bought a cheap 12v power lead for my SP3. Worked for a week, then gave up. Thought it might be the cable broke. Checked cable - all good. Opened magnetic connector.... not so simple after all.
It's jut a cable with a 12volt connector on the other end (which plugs into battery). The connectors must be available, as there are loads of similar cables very cheap on Amazon, eBay, etc.