globalrider
Alps Adventurer
Are you talking about BMW factory settings on the bike's charging system, or about the charger's settings?
If the voltage regulator isn't compensating, yes. One way to find out is to monitor the voltage while riding in extreme heat, that if you have a voltmeter installed.
I found a voltage regulator spec sheet by Bosch and was surprised to see numbers such as -11 mV/deg C. Whether all voltage regulators temperature compensate, I don't know. BTW, I'd sooner see them compensate for battery temperature which may not be the same as the temperature the alternator is at.
Heat kills batteries faster than cold does. car and bike batteries have a much shorter working life in the heat of AZ, whether they are charged or not.
What I've been saying. Every 8 degree C increase cuts battery life in half.