To wrap things up, I thought I'd post this table found in the article referenced below. Absorption and Float Voltages are listed for different types of lead acid batteries.
Absorption Voltage -- Float Voltage
Flooded -- 14.2V to 14.5V -- 13.2V to 13.5V
Sealed --- 14.2V to 14.5V -- 13.2V to 13.5V
VRLA ----- 14.2V to 14.5V -- 13.2V to 13.5V
AGM ----- 14.4V to 15.0V -- 13.2V to 13.8V
GEL ------ 14.0V to 14.2V -- 13.2V to 13.4V
My feeling is that the 2016 Camry is a bit light in terms of charging to increase fuel economy and prevent overcharging. They would assume that the car is driven at least several times per week and for a reasonable distance. Infrequent use of the car would be a problem in part because the parasitic current drain is continuous.
Note that the Honda information posted earlier shows a charging range of 14.4-14.9 volts.
My guess is that the Camry uses a conventional temperature compensated voltage regulator located inside the alternator. If that is the case, the alternator voltage would be related to the temperature inside the alternator. That would mean that the only high current charging would occur after a cold start. Charge current would be fairly low at most other times.
I think my infrequent short trips resulted in a long slow discharge of the battery. The car had a noticeably weak start two weeks before requiring a jump start. I must have dismissed the weak start since the car had not been driven for a while. The car was then driven 4-5 miles and restarted for the return trip. At that point the car was not driven for two weeks and it failed to start.