iPhone power bank recommendations

[vroom321]

Hi my kids have a couple of these but they aren't used as they can never tell if they're working and they take the cable off to use elsewhere. (Although if the wire is as useless as most then if that breaks the power bank is useless. So I'm stuck!!)

Ideally I'd like:
The wire connected so it can't be lost.
Battery Percentage display
A case
Good reviews

Thanks

Not sure these fit all your requirements but we've got a few of the Gethiu brand from Amazon. They have a battery display and hold a lot of charge, the actual powerbanks take a while to charge themselves but give out enough power to charge an iPad. We got two for about £18.

I would love some too for iPhones. i keep seeing ones advertised on Facebook (oasis-rain.com) but am suspicious about if it's a real company

The cables pull out and tuck back into the box.

Would love something like this from somewhere reputable.