Quoted from tiltmonster:
If I understand your point correctly, I think it's a lot cheaper to replace a battery holder than it is to replace an entire board and it's also much easier to replace the battery holder than it is to install the NVRAM if the board doesn't have a socket.
Might have lost ya there somewhere.. This installs by literally soldering off the AA battery holder from the remote board and or on the CPU and you solder this button battery board using 4 of the mounting holes that the AA board mounted. AA boards uses 6 points of contact this button battery board only uses 4 of them so it's an easy install. I attached a pic of the back side of mine and as you can see some nut got their iron too hot previously and took a few pads off my remote battery board. I was able to flow enough solder in the hole to make the connection thankfully. You can almost just heat the solder up, pop off the AA battery holder, and heat the solder again and poke the 4 posts through from this button battery board. Most WPC the ram is socketed and soldering on these old boards that already don't like to be heated up, can be touch and go with lifting off pads and destroying traces. In a nut shell if you want to not worry about the AA's blowing up and have limited solder skills this is the answer. One of the reasons I don't want AA's anywhere on my game... Good friend of mine has a pretty large collection of pins. His wife is "somewhat" into the hobby as well. She got a high score on one of his pins while he was away on business. She did not see her high score when she played the game the following night. She thought the batteries were bad. She took out his lithium AA's and replaced them with some generic brand AA's. Well he went into the backbox months later to trouble shoot a switch error and found the AA's she put in blew up and ran all over his CPU destroying it. For under 20 bucks this button battery board makes sure that never happens again