This pair of Lightning to USB charging cables is one of the best at charging your device. They're also very reasonably priced.
iPhone 6S Plus Slim Case, ZeroLemon Razor Armor Dual Layer Protective Case for iPhone 6/6s Plus 5.5"(Fits All Versions of iPhone 6/6s Plus)[180 days ZeroLemon Warranty Guarantee]
This iPhone 6S Plus case shields the phone from scratches, dents, and dings. The slim fitted design also offers easy access to all phone controls. ZeroLemon guarantees the Razor Armor for 180 days, and will replace the defective case/product for free.
ZEROLEMON iPhone 12 Pro Max Battery Case 10000mAh, Wireless Charging & Lightning Headphone Supported, RuggedJuicer Extended Battery Charger Case for iPhone 12 Pro Max 6.7" 2020
This case was the best at providing battery life, and we loved its many bells and whistles. It sounds great and looks sharp.
The ZeroLemon battery case is the cheapest and most robust option we tested and its 20 hours of extra battery life makes it a worthwhile purchase for power users.
ZEROLEMON Magnet Wireless Charger, Compatible with Mag-Safe Charger, [10ft] Fast Wireless Charging Pad for iPhone 13 Pro/ 13 Pro Max, iPhone 12 Mini/ 12/12 Pro/ 12 Pro Max/AirPods Pro
It didn't work with all phones at Amazon, but it's a fantastic wireless charger. And if you register it and mail it in, it's free.
This portable charger is designed for fast charging devices with USB-C PD ports, like the new iPhone 12 Pro, iPhone 13 Pro, Galaxy Note 10 Plus, iPad and MacBook Pro. Highly recommended for daily use and travel – perfect for reading, watching, gaming or listening to audio while on the go.
ZEROLEMON iPhone 13 Pro Max Battery Case 10000mAh, Wireless Charging Supported, RuggedJuicer Portable Extended Battery Charger Cover with Rugged Case for iPhone 13 Pro Max 2021
Battery case delivers on design and power. The ZEROLEMON iPhone XR battery case is the best at portability, charging, and protection, though it's the most expensive of the bunch.
This battery case makes my iPhone X go from 10 to about 2 hours of usage time. The bad thing is it's black and does not match my phone. Had to return it.
This is our favorite portable battery case, with a long-lasting battery and fast charging. It also easily charges wirelessly with the included USB charger, so you can charge your phone in your car.
ZEROLEMON Galaxy S20 Plus Battery Case 8000mAh, Qi Wireless Charging Supported, Extended Battery Charger Case for Galaxy S20 Plus
The ZeroLemon Galaxy S20 Plus Battery Case is an expensive case that takes a long time to fully charge, and it adds a huge weight to the phone. It's also difficult to use the phone while wearing it, and the battery life isn't as good as what you'd get from another case.