Hey bro, any tricks for permanently fixing the rear axle assembly issue?

Here’s the situation: I just replaced the battery, but it's dead again. After starting the car, after a while, it reports a battery charging fault. Then the ABS and airbag lights also come on. When idling in place, after a while, the car will automatically shut off. When driving, it feels like it doesn't shift gears automatically, and I can't switch to manual mode either. Vehicle: Peugeot 207 1.6 Automatic. The battery wasn't great initially, and I didn't pay much attention to it, usually jump-starting the car. A few days ago, I replaced the battery. First, during driving, it started showing a battery charging fault. After a while, the ABS light came on, then the airbag light lit up as well. It's like a parade of warning lights. Now I'm wondering if it's worth repairing. What could be the issues?

It seems like the Peugeot 207 doesn't have a USB port. How can I connect my phone to listen to music?