Here is a portable iPhone battery extender with a kickstand that keeps your phone powered up longer. The UAG Lucent Power Battery with Kickstand has a 4000mAh internal battery and USB-C port that provides up to 18 watts of charging power. Its aluminum kickstand extends up to 180 degrees and supports horizontal/vertical modes.
This battery extender has a polycarbonate body with soft touch coating. It has a convenient charging light indicator. You can find out more about it here.