&gt; So basically, default mode should be battery-saving mode.<p>The default mode is already a battery-saving one, you can get an impression of a non-battery-saving mode by playing a game continuously, your battery will get run into the ground in 2~3h.<p>&gt; Am I missing something?<p>Low Power Mode is not about downclocking the phone and trying to sip power, it&#x27;s about disabling a number of features which can already be disabled individually, but which (as far as Apple is concerned anyway) most users want&#x2F;use:<p>* animated transitions<p>* automatic mail fetch<p>* Hey Siri<p>* background app refresh<p>* automatic downloads<p>* wifi association&#x2F;roaming<p>* night shift<p>In essence, LPM makes the smartphone less smart to try and last a bit longer. If these are smarts you don&#x27;t need, you could disable them all along.