myCharge AmpProng+ Portable Phone Charger
myCharge AmpProng+ Portable Charger 6700mAh / 2.4 Dual USB Port External Battery Pack Power Bank Foldable Wall Plug for USB and Cell Phones (iPhone XS, XS Max, XR, X, 8, 8 Plus, 7, 6S, Samsung Galaxy)
Can't priase this charger enough! Saved my butt, many times.
This is why you want this:
Plugs into a wall - The others plug into a USB adapter and take FOREVER to recharge.
Simultaneous charge - You can charge your phone while recharging the battery (this is absolutely key when traveling)
Will recharge your phone up to three times (at least from what I have personally seen)
Has two USB ports - Two phones can simultaneously.
Charge meter - How much charge is left easy to determine. Also will activate "charge" when you connect your phone.