When Dan and I ride the KTM-Es together, its pretty cool what you can hear. Controlling traction of the rear wheel using the LHRB is huge since you can hear it skid. Can even talk to one another if there isn't a gasser too close. Sneak up on more wildlife too. Downside is that you have to honk at people you catch. I feel like sort of a dick when it surprises them but don't know of any other way to let them know we are back there. Many just pull immediately off the trail as a total shock probably thinking 'WTF did that guy come from?'
The UB aftermarket battery is 44% larger kWh, so additional range should match. Since we can get about 25mi out of the UB on a stock batt, that would be 36mi. The battery is $5k (OUCH!).
https://parts.electriccyclerider.com/pr ... -ultra-bee
The space under the UB seat is ripe for a 'piggyback' battery in parallel though. Why replace your existing battery w/ a larger one vs just add to it? Not sure you can fit 44% more under there but some solutions are surely in the works. Will be a lot cheaper too.
The UB battery is super easy to swap. No tools needed, very similar to the LB. The Varg... not so much. Its probably going to be cheaper/easier to just get a 2nd stock battery when they become avail. That works *IF* you loop back to the car once in a while. On long out and back trips, you'd need the piggyback or larger primary battery (or both!)
Be careful using videos like the one you posted that extrapolate range using the % drop over a shorter ride. Almost no-one does % accurately. Many base it on voltage which isn't linear. To do a better job you have to do Coloumb counting (Ah). No idea how 'good' the Varg % remaining calculation is. To really know range accurately, you have to run it closer to dead. Think of it like a gas bike. Its hard to estimate fuel left based on where you can see it through the tank. The tank is a funny shape and a fuel level half way down isn't 1/2 range remaining. Electric range should be a better estimate than that but most still haven't nailed it. So I don't trust the Stark % until there is better data. I'm betting the Varg gets ~35 in the riding we do. The KTM-E and UB have about the same battery size and go about the same low-mid 20s mi range. The Varg batt is 50% larger so I think it should hit mid-30s if you ride at the same pace. Its efficiency is likely very similar.