Haha, yeah i’m not surprised! I had a laugh when i read about the balancing resistors, how he sounded surprised when they got hot… though i have not looked further into the power switch and the charging, i don’t really see why it would not work. At least for the balancing that would be an easy fix with lower currents.
How far did you get? it would be very interesting to have a BMS with eswitch, that does not cut brakes on high voltage and that has communication possibilities with a vesc… Programmable number of cells and voltage levels would be very nice as well. From an oem standpoint, you both want to protect the battery at all times but also never cut the power leaving the rider in a possible headstand. Not sure how for example the raptor 2 does this but only using the vesc with an LVC “gives” the user a possibility to kill an unbalanced battery. this is also made worse if a dumb BMS is used, if it does not balance for example if the user never charges the board fully.
edit: @Giga, yeah its one of those i was thinking of. that sounds like its using usb PD mode 4, 60W. Or up to mode 4 maybe, i am by no means the person to ask about this. i know a fair bit about usb 2 but usb3… Either way, the hardest part about possibly using an usb3 power source is that it will not give you much juice without the cennecting device negotiating for it. This also happens in usb2, but the low power levels makes it much simpler and there is a sort of standard of requesting more power with certain voltages on the data pins. The normally allowed current on those usb ports is only 100mA, but since it’s not defined what they should do if a unit uses more than that, usually nothing is done about it even if a unit has not done any request for more power.
But since in usb3 the voltages also changes, possibly damaging units that cannot handle it, i expect that the negotiation is more strict and that you cannot get access to that power without a full usb3 control circuit handling the communication. I can very much see such a unit becoming available on ebay for example, just a pcb with a possible jumper for voltage and power out pads, but i have not seen any nor expect to really see any until usb3 becomes way more popular… which also fits with that even if you could whip up this usb3 charge port on the board, odds are that there won’t be a usb3 charger where you are staying. maybe next year there will though!