Review on 4100MAh Slim Rechargeable Battery Case For IPhone X XS 10 - Black, Protective Charger Case Compatible With 5.8 Inch IPhone X XS [New Version] by Aaron Masek

I've gone through tons of case chargers and this one is the best. It takes a standard iphone charger and you can actually use two to charge them faster, charge the phone and charge the case simultaneously. In the past you would just use one cable and it would charge both but really only charge the phone and once the phone was full, finally charge the charger. I also like how it turns on and off by holding the button for 3 seconds, make it less likely to turn on/off on accident. For $30 if this makes it 3 months Im very satisfied