Prevent battery devices to be checked for availability. https://github.com/Koenkk/zigbee2mqtt/issues/775

lib/extension/deviceAvailability.js

@@ -25,9 +25,12 @@ class DeviceAvailabilityHandler {
         this.queue.autostart = true;
     }
 
+    isPingable(device) {
+        return device.type === 'Router' && (device.powerSource && device.powerSource !== 'Battery');
+    }
+
     getAllPingableDevices() {
-        return this.zigbee.getAllClients()
-            .filter((d) => d.type === 'Router' && (d.powerSource && d.powerSource !== 'Battery'));
+        return this.zigbee.getAllClients().filter((d) => this.isPingable(d));
     }
 
     onMQTTConnected() {
@@ -102,7 +105,7 @@ class DeviceAvailabilityHandler {
     onZigbeeMessage(message, device, mappedDevice) {
         // When a zigbee message from a device is received we know the device is still alive.
         // => reset the timer.
-        if (device) {
+        if (device && this.isPingable(this.zigbee.getDevice(device.ieeeAddr))) {
             this.setTimer(device.ieeeAddr);
         }
     }