If the one you have works for you, I would stick with it. When you said you wanted to replace the battery, I immediately assumed you meant frequent replacement, like AA. I did not realize you mean after several years.

Not sure why you need to replace the screen. I have replaced a screen on a 64ST that I bought used on Ebay, followed instructions I saw on a couple youtube videos, the screen cost about $20 for an aftermarket one, but that was before tariffs. I could see in the photos before I bought the GPS that I would need a new screen.

I put clear packing tape on my GPS screens when new, replace the tape when it gets scrapped up enough.

Now you can buy powerbanks that hold a lot of watt hours. And a high charger USB-C charger that can charge them up pretty fast. If what you have burns through battery too fast, maybe you need a better power bank(s).