How much battery will drain if it is fully charged?

So my phone charger broke and I'm using my sisters until I get a new phone. So we both usually charge it while we're sleeping. So I'm charging my before I fall asleep and I use an alarm on my iPhone to wake up. So how much battery will drain when my phone has a set alarmed without it being charged.

As long as you don't have too many apps running in the background you should lose less than 10% in my experience. You could also put it in airplane or low power mode to try to reduce power usage even more.

Having the alarm set uses almost none of your battery energy. You are overly worried.

If your battery is in good condition your phone should be between 90-95 percent charged in the morning

Make sure you kill all open apps before leaving it.

You should do that as a matter of course any time you finish using any app.
(Double-click home and flick everything off screen).

Mine drains less than 5% overnight.

If the battery drain increases, kill all apps then shut down and restart the phone. Mine seems to need that every couple of weeks.

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