For an electric vehicle to recharge rapidly, it requires more power, and in a different format.
Old methods of testing a battery and alternator aren’t appropriate today. Do the job right to get the right results.
On older vehicles, the alternator and engine were never really connected. The alternator was internally or externally self-regulated to a voltage, but that was it.
When diagnosing a charging system on any modern import, think “smart.” I learned this lesson several decades ago when repairing a cranking, no-start condition on a 1989 Honda Civic, which was equipped with one of the first “smart” charging systems. After verifying fuse continuity, I discovered that excessively high charging voltage had destroyed the Honda’s Engine Control Module (ECM).