Seiko Instruments Inc. (SII) is entering production with a new coin-type lithium rechargeable battery, the MS920T, which offers a higher operating temperature than conventional rechargeable batteries. While the maximum operating temperature for conventional batteries is limited to, is 60 degrees C, the MS920T can operate at 85 degrees C. Coin-type lithium rechargeable batteries are widely used in various electrical devices, such as digital still cameras, Security and Dashboard Cameras, Thermostats, GPS, as a power backup for real time clock and memory. SII successfully increased the operating temperature for MS920T using its unique sealing technology and its optimized design to meet outdoors and inside vehicle applications.
Generally, using a lithium rechargeable battery at high temperature accelerates the deterioration. However MS920T keeps more than 90% of its initial capacity after 60 days of storage at 85 degrees C, though the conventional type batteries lose their capacity to 40% of the initial capacity under the same conditions. And the MS920T keeps stable discharge characteristics even after being over discharged to 0V.
The MS920T can be charged and discharged more than 100 times with 100% depth of discharge, when the battery is charged and discharged at 3.1V to 2.0V. It has a nominal voltage of 3V, a nominal capacity of 6.4mAh, measures 9.5mm in diameter and 2.0mm high and weighs 0.45g.