How to change battery an Capcom CPS2 b-boards

The following procedure and text is courtesy of  RETROGAMES.COM. GREAT site! If u dont dare to change the battery yourself i can do it for you...see my SALES site

WARNING!
The following procedure is only for those who are familiar with electronic components. We are NOT responsible for you killing your own or anyone else's game boards. Doing the following to your game board will void any warranty you may have.
 
To replace the battery you will need the following

• A Torx Security type screwdriver (normal one may do).

• A Gas Soldering Iron or solder station.

• 1 New 3.6v 1/2 AA size Lithium Battery.

• The nerves to do it.

Remove the Game board from the main 'A' Board if connected.

Locate the main fastening screws, one in each corner on the game boards underside. Now remove them with a special 'Torx Security' type screwdriver, you can also try a normal screwdriver if you do not have this tool. Sometimes there is also a 5th screw under a Capcom seal, if so you must also remove this screw. Beware of any electrostatic influence. To be sure we recommended you wear an antistatic bracelet to discharge your body before you remove the main game board PCB from its housing.

Locate the battery in the lower right corner. It's usually a red Maxell 1/2 AA size. We'll point it out to you if not 100% sure.

Turn the board over and carefully unsolder the original battery, then solder the new 3.6v 1/2 AA size lithium battery to the place where the old battery sat. Take care and make sure your putting the battery on with the polarity correct (see below).

Note. Do not be concerned about the board having no power while swapping batteries. I have swapped batteries like this with a 100% success rate. CPS-2 game boards can stay alive about one hour without power (I have tested this) so you have plenty of time without rushing.
 
Once you have the new battery attached to the PCB and you are sure the solder points are good you can assemble the PCB back into its casing and plug it back into the main 'A' board. The board is now ready to work for another 5 Years without problem.

FAMOUS LAST WORDS FROM ME:
Always check date printed on the new battery. THEN! count the new lifespan!

ADDITIONAL FAMOUS LAST WORDS:
What we can see from emulating experiences - and please correct me if im wrong - the battery is used for transmission of a signalcode. The signalcode is sent - what i know - about every hour or so. So if ur unlucky u have the battery outta the board just in the right time and ur board is dead. I changed batteries on 12 boards like this and 11 still live. But its the easiest way to do it :)

FAMOUS WORDS OF RESCUE:
If u wanna be 100% SURE ur board lives to see another day send it to me and ill rescue it the harder way...(see Sales)