Amazon Basics 65W One-Port GaN USB-C Wall Charger with Power Delivery PD 3.0, Foldable Plug, Portable, Fast Charging for Laptops, Tablets & Phones, Black

https://a.co/d/00mI3j7B I use this one with my xbox ally. Works great and doesn't get hot. Make sure you get a 65w or better rated cable. I also used a lenovo 65w laptop charger. But I suppose a Dell or hp would be just as good. They are usually in the $25 range and to me a much better deal than the ROG charger. I don't have the original charger as I got mine second hand. Of course you could always order the overpriced ROG charger.

Battery, no... stick to DJI. For charger, this is small, works great, and is affordable. https://a.co/d/0izaE4nD