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Add 3V button battery as power source to your project.
CR2030 provides up to 3V 210~225 mAh, and CR1220 provides up to 3V 38mAh power.
Both button cells provide very low discharge rate that can work for 1-3 years.
- One side battery holder for CR2032 and another side for CR1220
- One ON/OFF switch
- Two large output soldering pads of battery Vbat and ground
Each purchase is for one unit of the board. Schematic please see here.