Your alternator is not recharging the battery and is defective.
If it is running on the battery only then that means the alternator is not charging the battery.
As long as the alternator works and your charging system is correct, the new battery will start your truck and keep it running.
bad alternator ? its not charging the battery
No, that will have no effect on the battery.
Buy a new battery: that's a bad sign. just keep running it
If the donor vehicle is running and has a properly functioning alternator, no.
It sounds like the alternator is bad. If the alternator is bad the battery will not hold charge when running
Start the truck then disconnect the battery if it's still running the alternator is good
lack of fuel
u might of left the frickin light on
should but what run to long because all power in/on truck running off battery
With the car or truck running disconnect only the positive side of the battery ... if it stays running that means the alternator is good if it dies then it needs replacing