BMS 3S 4S Active Balancer Board 1.2A Lifepo4 Lipo Li-ion Lithium Battery Energy Transfer Equalizer Module Inductive Version $1.49 - $1.98 Min. order: 1 piece 10pcs U18 US1881 TO-92 OH188 1881 U18 TO92 Hall Effect Sensor Magnetic Detector Hall Sensor Motor $0.43 - $0.62 Min. order: 1 ...