Gen 2 Anti-theft alarm sks key programming?

Hello!

This is my first time posting, I bought a used 2004 Prius pkg9 for my wife. There are some perks that aren't working like the passenger window won't allways roll up, the back left door won't always unlock. Not a problem for the cheap price I got.

However, after surviving the chicken gauntlet and getting a new amazon sks fob to unlock the doors and start the car the anti theft alarm still goes off whenever trying to unlock the car with one of the fobs. Not sure if it switches between using different fobs. sometimes I can get the door open and start the car before we wake the neighbors. But if the car doesn't unlock before the anti theft is tripped, then I have to wait several minutes trying every possible unlock lock, hold next to door sks with both fobs idea possible.

Any ideas on how to... calm the car down? Something must have happened and now has PTTD (post traumatic theft disorder) I think the car has been in an unreported accident for the amount of exterior trim pieces I've had to pop back in and the missing fender liners on the front.

Can I program the car to "accept" the fobs without making a fuss?

 

I have a bluetooth adaptor that says it reads the voltage. It gave me 10V two weeks ago and 8.5V this week. Could this be a failing battery(no visible corrosion) or the... alternator? not charging it? Haven't been driving it much lately so I guess I will drive it around. It has been on long highway drives four weeks ago so I don't see why the battery should discharge that much. Still gets 48mpg though .