Just the other day I had a flat battery on my near three year old Nissan Qashqai. Never an issue before this and I suspect that my daughter may have somehow left sidelights on all night, although its lights normally switch off automatically when exiting the car unless specifically otherwise switched.
Anyhow, the point being that the battery was so flat that the dash went haywire and the start button couldn't stop it, because keyless start depends on voltage. The battery was down to 8V. After a jump start I drove it about five miles in the morning and another 12 miles that evening, then left it overnight. Next morning it started normally as if nothing had happened. So it doesn't take long to charge modern cars with stop-start systems because not only are the batteries capable of deep cycles but the electrical system, including the starter and, pertinently, the alternators are uprated appropriately.
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