Sorry to necro this but just to confirm I read this right. If I don't want to cut the 470 resistor then I can just use a coincell holder and a ml2032?
No and I wish people would stop recommending that.
Go read the data sheets for that ML2032 and you'll discover it is being WAY overcharged in that circuit. That circuit was not designed to charge a coin cell and you risk leaking/rupturing of the battery.