How can I show remaining battery power on the HUD?

I’ve been looking online for tutorials and asking friends and I’m getting no results. I need to be able to show the remaining battery power for my flashlight in the corner of the screen. Example “Battery: 94%” And it would count down as t’s being used. But stops when counting when turned off. Any suggestions?

Also on a side note, one other thing I can’t figure out is I want to be able to pull up a phone out of the corner of the screen (Like in a GTA game) Just to be able to check a time on it. This is probably way out of the ballpark, but any clues towards this as well? Thanks!

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