Andy,
Thanks for your comments.?
I would suggest that RC battery packs without BMS are unsafe in the hands of people that don't understand the technology.? For example, there's nothing to prevent someone from overcharging them by using the wrong kind of charger.? Over-charging can cause thermal runaway and result in fire.? Even on the right charger, if someone doesn't appreciate the need to balance the cells, one or more cells may eventually become seriously over-charged.
I build multi-rotor RC helicopters for a living.? I don't know of any that disconnect the load when the battery drops below a certain voltage.? In my view, that would present another safety risk when the aircraft falls out of the sky.? In my early days of flying electric aircraft, there weren't suitable Li-Po batteries and chargers available, so we used Milwaukee V28 tool batteries.? However, we stripped out the BMS so that they couldn't shut off in-flight.? Ultimately, we removed the 7 individual V28 cells to assemble our own 3S and 4S battery packs.? Today, my flight controllers start the aircraft toward home at a certain low voltage threshold and land it if the voltage drops below the next threshold.? ? ? ?
Cheers,
Don
? ?
Don LeRoi