Navicom RT-420- 11-Build in BatteryThe RT-420 model has the Build in Battery design likes the iPhone there are three steps to installationand removal the battery in below diagram.Step1Step2Step3Connection CableDue to the RT-420 got the build in battery. Therefore, we do place the IP68 connection cable (1.5meterlength)forpowercharger.Italsousedforthesoftwareupdateandautomatictestinmanufacture stage.For Power charger: