10. Label the battery with the date, or make a note of the date somewhere in a safe location.
11. Prepare the board to be re-assembled and make sure to align the PCB with the "solder-side up" and oriented as shown:
Relax with the knowledge that next time, all you have to do is insert a 3.6v 1/2 AA battery!
This was a fun project to complete since I have several CPS-2 boards and had always worried about the battery dying and dreaded having to change it. Now, with this simple modification, every time you need to put in a new battery it will literally take seconds! Also, you are saving potential damage to your board from re-soldering over the same terminals every time. You may be surprised to learn that some original Capcom CPS-2 boards can last an extraordinarily long time without the battery dying. Just recently I pulled out batteries dated August, 1993! Almost 13 years! How is this possible? It all depends on how much usage the board has gotten over the years. If you bought your board from an arcade operator that had the PCB on location (in an arcade, laundromat, etc.), then the board itself was turned on and in use for the most part of every day...and therefore not using the internal lithium battery at all! However, waiting this long is a gamble since the battery could die at any point. Don't delay, save your board today!
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Originally written by
Tormod Tjaberg: 
Updates, revisions, additional pictures and clarifications by JAMMAPARTS