I don't recall anyone here using regular RCR123 on the G2X Pro, to see if the driver can handle it. However, try to run primaries and see if you can reproduce the problem.
Depending on how you use, how hot they get (hot cars for example) and other factors, one year can kill a battery.
Anyway I recommend you to use one 16650 battery, it has equal or more runtime than primary CR123, flat regulation and the voltage is safe.
The tailcap could be the culprit since you said it wasn't turning on recently. Try to clean all the contacts with isopropyl alcohol, and also isolate the tailcap out of que equation, turning on the light touching the negative from the battery to the body using a metal object like a paper clip.
Depending on how you use, how hot they get (hot cars for example) and other factors, one year can kill a battery.
Anyway I recommend you to use one 16650 battery, it has equal or more runtime than primary CR123, flat regulation and the voltage is safe.
The tailcap could be the culprit since you said it wasn't turning on recently. Try to clean all the contacts with isopropyl alcohol, and also isolate the tailcap out of que equation, turning on the light touching the negative from the battery to the body using a metal object like a paper clip.
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