[GFX8]

Hello, I have an 07 328i, with 160k miles 6 speed manuel. I will give a list of what has been changed within the last 2 months.

1/15/2020 - Vlave cover gasket & cover
1/27/2020 - Disa Valves/MAF
2/02/2020 - Starter/Plugs and coils

The car has been driving great, last week on Saturday was the last day I drove it as it started raining in my town. Today Wednesday i was going to drive it to go to work, and noticed my alarm didn't work, it didnt unlock my car, so I used the key and no lights on, everything was dead. I used a power amp jump starter, all my lights turned on and the car started right up. But it had this almost whining squeaky sound coming from the engine. It was so dark at the time so I couldn't inspect the belts any further. I quickly drove it for 2 blocks, but the sound was not satisfying at all... any suggestions on what could it be? does the alternator work harder with a very low battery that causes some stress on the belts or to the starter mechanism to make that sound?