In my XC70 one terminal of the battery is hidden from view - to hook up jumper cables, one uses the positive terminal of the battery and connect the ground cable to an engine mount on top of the engine.
Look in your owner's manual - there probably are locations where you can hook up jumper cables under the hood - your charger could be wired there.
Somewhat far-fetched - See if your cigarette lighter (12v power connection in the console) is live when your car is off. If so, you could also wire this up to trickle charge - if your battery is down to begin with, you could blow a fuse.
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