I have created a plugin in SignalRGB to make this happen.
If Hyperflux v2 is detected as a dongle. A: Can be connected to it directly Same options as Synapse. B: Gives all compatible mice a new battery optimizer option. When this is activated it forces use of that mouses battery to be watched. It also brings a dropdown to choose what level the mouse is to charge to. When Hyperflux is sent a battery level above the threshold it disables Hyperflux's charging. When the mouse reaches 5% below threshold it enables charging on Hyperflux.
Make this happen in Synapse please!