Old thread but technology improves by the year so I hope this helps. I have had great luck with the charger I keep with me. It has the solar recharge option and recharges my iPhone X pretty fast. It's' also held up to many, many charges.
I got it on Amazon a while back. https://amzn.to/36k01VD
I use a $70 one I got from Amazon (link below) and a multi-charger which has been a godsend (it has iphone and android hookups all in one retractable cord. Your charger cables are important too. They should support fast charge.
Batter Pack: https://amzn.to/36b87zX
Charger Chord (seriously these...