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Lithium Battery Level Gauge for 1 Cell 3.7V Battery - Display colour BLUE
This LED gauge shows the charging level of a single cell 3.7V lithium battery. The 5 different levels are as shown on the picture. Therefore, each level equals the following cell voltage: 100% : >3.9V 75% : >3.7V 50% : >3.5V 25% : >3.3V If the voltage is under 3.3V, only the red frame is