Rancang Bangun Purwarupa Alat Pemantauan State Of Charge Baterai Lithium-Ion Point-to-Point Berbasis Mikrokontroler Arduino dan LoRa Sx1278 433MHz = Design of Prototype Monitoring Devices State Of Charge Point-to-Point Lithium-Ion Batteries Based on Arduino Microcontroller and LoRa Sx1278 433MHz