If it were me, I would replace the battery with a good aftermarket battery (something with Samsung or Panasonic cells). You'll need to change the battery mount/connector, but those generally come with the aftermarket batteries. You can even get adapter cables for the connectors if you don't want to splice the wiring. It will probably be between half to two thirds the cost of buying a new Rad battery. With everything I've seen and heard here about all the issues with the new Rad Rovers (and their troubles with service/warranty), I wouldn't but a new Rad Rover 6. I would buy a different bike from a different manufacturer instead. I have two Rover 5's that I've had since 2020. One has about 600 miles on it and the other had about 2000 miles on it. I love those bikes. I've done some upgrades on them, like the Bolton controller, but nothing due to any kind of problems. There are lots of aftermarket parts out their for them if you do have anything that fails. I also own a Lectric Trike, and I like it very much as well. It seems to be as well built as the Rad's. The Lectric bikes are different from the Rad's, like being much smaller, but they are also a lot less expensive. 


Just my opinion for what it's worth.

Sorry. It sold.

I have these two on my two Rover 5's. I think I like the Lumiere one better, but the Rockbros one is probably more waterproof.

https://amzn.to/3QPHgnU

https://amzn.to/3qDw57e

The link works for me both by letting it detect my location by GPS, or by entering a zip code. Very strange.

Lectric has CST 20" x 3" tires on their website. I don't think they're the Big Boats. They have a knobby tread pattern. They're 2 for $50.


https://lectricebikes.com/collections/parts/products/cst-tires-2-20-x-3

I would buy a good aftermarket battery from Amazon or somewhere else. It will likely come with a new mounting plate/wiring. Those are generally an XT60 connector. The website below sells dual battery kits, but they also sell adapter cables for Rad so you don't have to cut/splice any wires. You can get an XT60  to Rad adapter cable for like $20 that you can use with the aftermarket battery.


https://electricallwheel.com/store/

I think this is what you're looking for.


https://amzn.to/3NOuOmH

That sounds like you might have a bad display. I've had mine for about 2 years and have gone close to 2000 miles with it. Mine is still on the default brightness setting and I haven't experienced this issue. You may be on to something with polarized sunglasses helping. They can definitely have an effect on reflections. I remember wearing my polarized sunglasses in my car and having them totally block my heads up display that reflects up onto my windshield. I thought it was broken until I took off my sunglasses.