I'm looking for the answer of what that option does if turned on. Preferably by the rom creators if possible. My friend and I play with it on all the time so our user records are saved, but I'm wondering if there is any negative to doing that.
If you turn it on, use one of the last two (added teams) being VAN or WSH, play a game, then check the win loss ratios of the teams you will see that VAN or WSH percentages etc. will be wrong.
This is because the game only ever made the battery backup expecting only 28 teams. The above is a simple example of potential corruption to the battery backup data. There may be more corruption when it goes to save player data for these teams? Over extended use, this could completely stuff your games