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Hello,First of all please make sure that also the starter battery under the hood is properly charged. Battery control module controls the charge state of both batteries.
If both batteries are ok, but problem persists- disconnect the trunk battery for several hours. THis should reset the battery control module and the fog lights electronic fuse.If the ABC has not been bled out after replacing the strut with Star Diagnosis computer- this must be done first. Flush and filter change is also a good idea.
Connecting Star Diagnosis and reading out all of the fault codes will clarify what is causing the battery and fog light issue, if battery disconnect will not help.
If this did not help, this is all what can be done without Star Diagnosis computer. Electronic fuses are built into fron SAM module. Next steps are to delete the fault codes, and update the battery control module software. The fog lights can be switched on for testing with the Star Diagnosis as well to make sure that electronics and wiring are in order. One thing to keep in mind with the bulbs- they mist have the same rating as the original bulbs.