I have a Mini 4 , a little over 600 hundred miles since I got it in the fall of last year, Michigan weather shut me down for awhile.
 I have never felt safe on it, balancing is hard at low speeds.  So I took my 25 year old Trek out today,  no problems with balancing, is it larger tires and a gyroscope effect that helps.

I do like my Mini, any low speed turns are not good.

A bull rider has to balance. You shouldn't have to balance on a bicycle with a saddle and hand grips. If they're spaced right,  your upper body is stable on a tripod of your arms and spine. All you have to do is steer.

I believe my Radrunner 1 had a seating position like your Mini 4. My "balance" was so poor that I was an accident looking for a place to happen. I got a bad case of tennis elbow trying to control the bike with my right hand when I took my left hand off the bar to signal.

If I attempted a u-turn on a quiet street 18 feet wide, I was likey to fail. The problem was instability, not balance. The hand grips weren't far ahead of my belt. My "tripod" was too short for stability. I moved my saddle 7" aft with a layback seat post. With a more stable seating position, I could make u-turns on a 10-foot driveway.

Metal fatigue makes spokes fail, but I've ridden bicycles and motorcycles for decades without a spoke failure. I keep most of my weight on the pedals most of the time, which means the front wheel is loaded almost as heavily as the rear. Maybe the front has stood up better because the spokes are longer.

I've found the difference between my front and rear spokes. The heads of the front spokes stick out of the hub like roundhead rivets. On the rear hub, they're like countersunk rivets. Some are more sunk than others, so I'm afraid a catastrophic failure is looming.

I used to wonder why so many WWII aircraft had their metal skins attached by rows of roundhead rivets, not countersunk. Now I see. With its thin edges, countersunk rivets are more subject to metal fatigue. I don't recall seeing spokes with countersunk heads before. What was Radpower thinking!

They don't sell replacement spokes. I hope my wheel holds together until the boat arrives from China.

I've never had to plug in the charger to the battery first then the charger to the wall until I bought a RAD bike. Seems like a bad design or designed to sell more batteries. Sounds like a Recall to me but I doubt that will happen. As time goes by there is more and more bad things with RAD products and service. More and more BBB complaints also.

Jim

https://images.app.goo.gl/QEBG6mK81qJrYxrP9
 So I decided to take the bike to go see fireworks  at Greenfield village. I am going with the flow of traffic,  a lady with a stroller needs to cross, the officer had traffic stopped in the other direction.
 The man behind me is now blowing his horn at me, I wave , only one second. Not good enough,  he decided hitting a bike gently was a good idea, not good.
 I am old, fat, and ugly.I decided it's go time.  He a third of my age, the officer heard everything. 
 Short story long, no damages,  the fuse in this world gets shorter every day. Be safe, love what you see, forgive what you hate.

RadRover 5 and a RadExpand 5