I have a similar model that I bought at Ohio pinball show. Works .. Don't know much about it. Didn't even know it had a battery.

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Did some research online and it appears when the security key battery dies on these machines they no longer function. Some guy posted a work around to get system working but way over. My head. That really sucks.

Did more research and confirmed these units will not operate once security key battery dies due to encryption. There is a guy who posted free hack info on you tube to put encryption on hard drive for games with 2011 software only. He also sells the service on ebay for $125 for people without the skill to hack. Without this upgrade these machines will not work once the security key battery dies. Wish. Would have know this when I bought my unit.

I'm going to bite the bullet and do the $125 hard drive upgrade. I only paid $300 for the unit so I'm not in too deep.

New hard drive boots faster,more responsive and security key not connected with battery life. Did have a problem where machine constantly beeps and picture of magnifying glass. No boot. Fix was to reseat the two sticks of ram on right side of the motherboard. Got hard drive from arcade cabinets .com. Hope this helps somebody.