Q: My car battery will not hold a charge

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It started one day while driving, my battery light started to flicker in a very irregular way, shortly after the cars engine began to lose power and the accessories started to dim and stop working. Eventually the engine lost all power despite the car still being on. When I pulled over and shut the car off it would not restart and neither would any accessories. After getting the car jumped it very weakly got me home. I replaced the battery and the car seemed to run fine for a few days and then the problem reoccurred. I then replaced the alternator and jumped the battery, the car started and idled but at times the accessory lights would flicker and when I turned the headlights on it killed the car instantly, as if the key was turned to off. I am not sure where to check next, could bad terminals cause this issue?

My car has 210000 miles.
My car has an automatic transmission.

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