Well, Pete. It may not make sense, but my ‘23 behaves the same way. iPhone 12, Apple cable. When connected to BRP Go using Sygic, for example, the phone screen is dimmed. The USB connection can slightly break even with the phone power needs. Mine would charge about 5% in about 2 hours. I would expect that to vary by phone, and the number of Apps running in the background.
If using the phone as a GPS by itself - which I thought was what Brent was doing - the screen is always on at full brightness. The phone uses way more power than that USB port can provide, and the battery discharges. Maybe the MY 2021 are different, I don’t know. But I don’t think that USB port was ever intended for that type of usage.
Yes, it’s not about the voltage at the USB port, it’s about the wattage available. A 5 watt charger and a 20 watt charger both have the same USB standard voltage. The 20 watt charger can supply more charging energy faster. What is the available power from the Spyder? Don’t know. Can’t do anything about it, anyway.
The video that was posted is misleading, in that the phone was connected to BRP Go, the screen was dimmed until she shutdown, and she stated that the phone was in Low Power Mode when she started the ride. Thus, its power requirements are reduced, mainly but not limited to the cellular radio, processor speeds, and background operations. That would help it to charge faster. An iPhone stays in Low Power Mode until 80% charge.
I agree with Brent. The horse has been pretty well beaten.