SUA2200RM2U not powering up...another one

[OrangeSchneider]

Hi there, I recently picked up a used SUA2200RM2U(Serial number is JS0930029106), 2009 model it seems.  I had no idea the state it was in, but took a chance. 

It doesn't start up, so now I'm in troubleshooting mode.  I'm sure the batteries are dead.  Unplugging them and measuring it's voltage is pretty much 0V.

It does get 110V input, I can measure the input cord; but I hear no clicking of any relays, no fans, no LEDs, no wiring fault LEDs, nothing, not a peep.  

My research(mostly on this forum, some reddit) seems to indicate that it has to have 48v battery connected to even think about starting up, is that accurate, can anybody confirm?

I don't want to spend more trying to revive it if it isn't going to work.  I found this post. Do you think this will work for this model?  i.e. charging the two large white caps with a 12V wall wart and crocodile clips? At least to confirm that it is the batteries.

Anything else I can try before I go to this extreme level?   

[Teken]

You can use that method or similar where you connect a sufficiently large capacitor to the battery terminals which act like a battery. 

The benefit of using this method is the system will complete the Self Test during the POST.

The other method simply allows you to jump start the system. But, in no way tells you if there are other active faults / errors present.

Lastly, if you have read enough information regarding this specific hardware. You should be prepared to replace all capacitors, relays, and power transistors. 

The system is 16 years old and the service life is 10! 🤦‍♂️

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