Ballly 5000 plus 82 error on power up

[gposing]

I just picked up this machine and when I power it on I get an 82 error.  I am going to get a new battery this week.  It only tests at 1.6 volts.   If I turn the jackpot key it changes to 52  and  45.   I can run the tests on the system and so far all seem to be fine.  When I get the 52 45 error, I press reset then I am able to press the red coin in button and the system works for about 4 to 5 spins then the 45 comes back.  Does anyone know what the 82 power on message means and the 45.  I am assuming the 52 is a door open message.   I found a post that the error message are supposed to be posted on the inside of the machine, but there is a large label on the inside door that is missing. 

Thanks in advance.

Gary