31mA is significantly more than most coin cells are designed to supply - while a new one may be able to reach peak currents of 50-100mA this significantly reduc

31mA is significantly more than most coin cells are designed to supply - while a new one may be able to reach peak currents of 50-100mA this significantly reduces battery capacity, and is only possible with a new battery (once it's partially discharged it cannot sustain these current levels any more).