I&#x27;m not saying this to start a war, but I don&#x27;t use an iPhone. I use an Android phone. I have found the Facebook Lite app on Android to use virtually no battery when idle. I know that this app was pretty much designed for low power phones.  
It&#x27;s odd that on the one hand, they are thinking about low powered phones and using less data while on the other hand, as with iOS, they aren&#x27;t.