Intern impedans 80 ohm, 3.0V

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The MS621FE-FL11E from Seiko Instruments is a manganese silicon lithium rechargeable battery with PCB pin terminals. Since this device use silicon oxide as the anode and a lithium manganese composite oxide as the cathode, it results in large discharge capacity and long cycle life.
Nominal voltage is 3V
Battery capacity is 5.5mAh
Operating temperature range from -20°C to 60°C
Battery diameter is 6.8mm
Battery height is 2.1mm
Battery weight is 0.23g
Internal impedance of 80 ohm
Standard charge discharge current is 0.015mA