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FrSky battery voltage sensor is provided as 2-way telemetry systems optional accessory. Voltage ranges: 1S LiPo: 0V~6.6V 3S LiPo: 0V~13.2V 5S LiPo: 0V~19.8V voltage option Max LiPo pack count Voltage division ratio 1S 1S 2:1 2S 3S 4:1 3S 5S 6:1