AFAIK that does not affect battery life, or at least is that experts says. However I'm not sure of that.
I thought that cutting +12VDC cable in USB cable it can be done, but I've not tested yet (I need to purchase a new cable to test it but when I go to street I do not remember to purchase it and when I remember it I cannot go).
But it is a must in my TO-DO list.
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