hi bro, iphone ku best ah irka power bank solunga bro, wired power bank.
Any branded powerbanks use pannalaamnga. URBN, Anker or Spigen Brands. with original or mfi cable use pannurathu better and safe bro.
https://amzn.openinapp.co/it58k
https://amzn.openinapp.co/c9bxq
If you already have any wired powerbank you can continue using it bro.