Question: how do i check the battery on my beats on iphone x?
Answer: Swipe Down from the Top of the Screen.
Tap on Today Tab. Scroll up to reveal the Edit button.
Tap the Edit Button.
Add Batteries to the Today Widget. Tap the green/white + button next to Batteries.
You Should Now See Batteries in the Today List. ... 
Turn on a Paired Bluetooth Device to Reveal Its Battery Status Under Today.