The best alternatives to mybumper Battery Case are Apple, Little Snitch, and ThinCharge Battery Case. If these 3 options don't work for you, we've listed a few more alternatives below.
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Quip Case is a charging case that charges and stores the Apple AirPods and iPhone. This innovative solution prevents loss, dead battery, and the need for multiple cords. It has fast charging via a USB post and will extend the better life or the iPhone by about 70% and charge the AirPods about 20x from 0
iPhone users, if you're looking for more battery life, a protective case, experiencing effortless charging, you should take a look at FITCAZE! Meet the World's thinnest & lightest iPhone battery case supporting QI wireless charging. For iPhone 8/7/6S/6 & Plus.