切れるとは思えないが・・2chより STMicroelectronics M4T28-BR12SH1 仕様： M4T28-BR12SH = 48 mAh ProvidesBatteryBackupPowerforNon-Volatile TIMEKEEPERs and Controllers in the SNAPHAT SOIC Package lithium coin cellと32.768KHzのクリスタル