I had a similar 'problem' with intermittent use of the car and 'worries' about the battery going flat.
My idea was quite different!
I bought a solar battery charger of that well-known auction site (loads on there). Pop the bonnet, put the clips on the battery and the 'charger' inside the windscreen and, as they say: "Bob's yer uncle".
But... for protection, I did put an in-line fuse on the +ve charging lead!
Conecting/disconnecting the charger was a doddle and I could keep it in the boot (though always making sure that the croc clips couldn't touch).
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