BangleApps/apps/powermanager/boot.js

(function() {
  var settings = Object.assign(
    require('Storage').readJSON("powermanager.default.json", true) || {},
    require('Storage').readJSON("powermanager.json", true) || {}
  );
  
  if (settings.warnEnabled){
    print("Charge warning enabled");
    var chargingInterval;

    function handleCharging(charging){
        if (charging){
          if (chargingInterval) clearInterval(chargingInterval);
          chargingInterval = setInterval(()=>{
            if (E.getBattery() > settings.warn){
              Bangle.buzz(1000);
            }
          }, 10000);
      }
      if (chargingInterval && !charging){
        clearInterval(chargingInterval);
        chargingInterval = undefined;
      }
    }

    Bangle.on("charging",handleCharging);
    handleCharging(Bangle.isCharging());
  }
  
  if (settings.forceMonoPercentage){
    var p = (E.getBattery()+E.getBattery()+E.getBattery()+E.getBattery())/4;
    var op = E.getBattery;
    E.getBattery = function() {
      var current = (op()+op()+op()+op())/4;
      if (Bangle.isCharging() && current > p) p = current;
      if (!Bangle.isCharging() && current < p) p = current;
      return p;
    };
  }
  
  if (settings.forceMonoVoltage){
    var v = (NRF.getBattery()+NRF.getBattery()+NRF.getBattery()+NRF.getBattery())/4;
    var ov = NRF.getBattery;
    NRF.getBattery = function() {
      var current = (ov()+ov()+ov()+ov())/4;
      if (Bangle.isCharging() && current > v) v = current;
      if (!Bangle.isCharging() && current < v) v = current;
      return v;
    };
  }
})();