you could buy the current rad throttle that does work with the older electrical systems. I have also heard some say you can take the switch apart and connect the wire inside together to bypass the switch, but I have not tried this. i just ordered a new one from Rad without the switch.

Here is the combination I use for my cell phone mount. I love it and it is very sturdy.

https://amzn.to/3HnRSSt

https://amzn.to/3pf7B0a

I rotate my two batteries so I get an even amount of use from both.

I had the same reply recently when I asked about balancing the Semi-integrated battery. I also have a mini with the Standard battery that does require balancing.

Here is the reply I got from Rad about this:

The new batteries on the Rover 6+ and the City 5+ do not need to go through a special balancing procedure. The balancing of the cells is actively done during the charging process whenever the battery is charged. The green light will not come on, on the charger unless the battery is balanced and charged.