No, if you aren't wiring the 3v CMOS battery just leave it be. Custom regs only supply power when turned on, so when you turn the system off the clock will reset anyway. You need the CMOS battery to keep the clock running when the system is turned off, but it's not essential for anything except Animal Crossing.I noticed that the components that keep the MX chip from overdrawing get power from the battery, which is 3v. Do I still need to give that power, or will I be fine without them? And if I do need to power them, can I use the 3.3v from my regulators instead?