The Seiko MS421R IV03E Battery is a Rechargeable Lithium Coin Cell battery, built for memory or back up applications. The MS421R Battery comes complete with solder tabs for soldering directly to your device.
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MS421R IV03E Battery Specifications:
Chemistry - Rechargeable Lithium
Voltage - 3V
Capacity - 1.5mAh
Dimensions - 4.8mm x 2.36mm
Operation Temp - -20 to +60C
BIN ML-9