With a 5mm LED that consumes 10mA a good quality car battery will last about 140 days.
All my white LEDs are from cheap Chinese solar garden lights and my blue LEDs are from Agilent (formerly Hewlett Packard but they have another new name now) and are over 3.0V when fairly bright with 10mA or more.
I have never seen a CR123A battery but Varta and Energizer rate its capacity when its voltage has dropped to 2.0V which will not light a white or blue LED.
Energizer's datasheet shows its voltage is less than 3.0V when it new with a 28.5mA load so it will also not light my white and blue LEDs even when it is brand new.
(A white or blue LED needs about 3.0V to 3.8V so the batteries probably WILL NOT WORK,)
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