TinyCircuits
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SparkFun Electronics
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Seiko Instruments
BATT LITH 3V 3.4MAH COIN 6.8MM. Coin Cell Battery Recharge Battery/Tab RTC/SRAM Backup
Seiko Instruments
BATT LITH 1.5V 2.5MAH COIN 6.8MM. Coin Cell Battery TS621E W/Tab RTC/SRAM Backup