I have an ESR 10000mAh Power bank. One important thing I’ll stress to you is make sure you ask is it MagSafe compliant? Not MagSafe compatible. Is it actually Apple MFI certified because if it’s not (like mine) it will only charge an iPhone at 7.5w wirelessly as opposed to 15w. It’s tricky because you read the specs and it says 18w capable but that’s Android charging.