Smart Battery Monitor

My own version of a battery monitor that can warn a bit ahead of time.


  • Battery Monitor
  • Copyright 2014 Anders Heie
  • Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except
  • in compliance with the License. You may obtain a copy of the License at:
  • Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
  • on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
  • for the specific language governing permissions and limitations under the License.

name: “Battery Monitor”,
namespace: “Pope”,
author: “Anders Heie”,
description: "Monitors all Battery levels and sends a notification if lower than a set threshold. A Button allows an immediate check. ",
category: “Convenience”,
iconUrl: “”,
iconX2Url: “”)

preferences {
section(“Battery Settings”) {
input “threshold”, “number”, title: “Alert when below…”, required: true
input “batteries”, “capability.battery”, title: “Which devices?”, multiple: true
input “theTime”, “time”, title: “Time to battery check every day”

def installed() {
log.debug "Installed with settings: ${settings}"

def updated() {
log.debug "Updated with settings: ${settings}"

def initialize() {

//schedule the job
schedule(theTime, doBatteryCheck)

//run at install too


def doBatteryCheck() {
log.debug “doBatteryCheck called at ${new Date()}”

def belowLevelCntr = 0

def pushMsg = “”

for (batteryDevice in batteries) {
def batteryLevel = batteryDevice.currentValue(“battery”)
log.debug "${} ‘${batteryDevice.label}’ battery: ${batteryLevel}% versus alarm at ${settings.threshold}"
if ( batteryLevel <= settings.threshold ) {
pushMsg += "${} ‘${batteryDevice.label}’ battery: ${batteryLevel}% \n"

if (belowLevelCntr ){
	pushMsg = "You have ${belowLevelCntr} devices below the set alarm level ${settings.threshold}% \n" + pushMsg

} else {
    pushMsg = "Battery Check App executed with no devices below ${settings.threshold}%"





what makes this one different than the others?

I don’t know, I haven’t really look at any others. Just trying to share.

Fair enough, just thought you had some improvements to an existing Battery Monitor.

That’s a nice idea to have an app for that except when sensors go from 100% to malfunctions just over night.
This kind of apps makes sense with brand new sensors and batteries, but once you enter the vicious loop of Amazon ordered CR2450 by 20 every 3 or 4 months, you will realize that the only way to detect battery low is when:

  1. sensors turn off-line
  2. sensors have erratic behavior like reporting temperature but no longer open/close or acceleration.

Thanks for sharing though

Yeah, malfunctions are harder to detect. Maybe the battery works, but no one opened the door for a week, which could look like a malfunction but it’s not. I really just wanted the switch batteries just BEFORE they run out, rather than get annoyed right AFTER they run out, so thus… this app… :slight_smile:

Getting an error when trying to install;

startup failed: script_app_metadata_b6f999d6_15c5_422d_ac29_b5b91b163078: 13: unexpected token: Monitor1” @ line 13, column 16. name: “Battery Monitor1”, ^ 1 error

Any idea?