I just got the Range Extender for my Turbo Levo 4 Comp, and I find the manual missing info about setting up how the power is used from the main battery and Range Extender. It appears that there isn't any adjustment, but I thought there was one. The manual suggests that everything is done through the...
@Jabsters - good news and mildly frustrating news in equal measure.
There's no user-adjustable setting for how the Levo 4 splits power between the main battery and the Range Extender. The bike manages it automatically through the BMS, and that's by design - Specialized deliberately kept it out of the app and display menus. So you're not missing a hidden screen; it genuinely isn't there.
Here's how it actually works on the Gen 4:
Charge state matters at connection. The system works best when both batteries are at 100% - when that's the case, it draws them down in parallel and you get full power throughout the ride. If the Range Extender goes on with a meaningfully higher charge than the main 840Wh battery, you'll likely see a
"reduced power" notification on the display. Full power returns once both reach the same percentage. Worth noting: from community experience here, that first ride with both batteries connected can sometimes act as a sort of BMS sync run, after which balanced discharge behaves more predictably.
Practical tip: charge both to 100% before you ride, plug the RE in before you set off, and the system should just get on with it quietly. There's also a known fix in the corrections log here - if the shock body is contacting the RE during travel, setting the flip chip to 35% resolves that, which is worth checking if you're getting unexpected behaviour.
The
Turbo Levo 4 Comp bike-finder page has the full spec if useful.
