A Bike That Does Exist, by PEM

[PedalUma]

@Gionnirocket, All I can say now to address your valid question is that when charging in the Off position charging goes quickly to 44V and then slows way down to reach 49V and the LED on the charger goes from red to green and it stops charging. When while still on the charger if you toggle the battery On the charger LED goes from green to red and it charges to 54.6V on a 48V nominal battery and the charger's LED goes green again. My rep said to do that about once per season for a typical rider to load balance the cells. But to only do it just before a ride so the battery is not sitting at 100%. He said that it is like pressure in a ball in that you don't want to store it fully inflated.
She is stopped in the town of Newport that appears to only have one business and 68 residents. It is a room with an honor system pool hall. When you take snacks you leave money in a slot.

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[Gionnirocket]

I'm not sure how the term load balancing is being used here but load typically refers to discharging and/or use of electricity on a multi phase system. Maybe he meant Top Balancing? That's what most passive balance BMS use.
Then depending on how you want to calculate SOC (actual vs usable) ... 49v is somewhere between 70% and 80% on a 48v system
That said if that's how your batteries work it's pretty neat that the standard charge is near 80% and that a full charge requires user intervention.
If so that's very good for the battery and for safety... but that might also be a real pain in the ass if you need over 80% on a daily basis.
That, that said... 80% works well for me, even on my smaller 10Ah battery.