Now that more like it
If that chip works I owe you a beer or 6.
We've ordered a few of the Diodes INC chip and spun a dev PCB... I'll post when I've had a chance to test it.
The biggest problem with trying to find these bespoke chips is actually knowing what keywords to look for.
We actually contemplated the button solution and even got as far as building it. However, the constraints of the enclosure mean a button is a bit hard to do and if the button ever failed it would completely bypass the BMS.
We made a digital version of the above circuit, using an RC circuit to momentarily fire a load switch across the BMS when the battery was first installed.
However, this felt extremely janky and was the last resort in case we couldn't find a BMS that did what we wanted.
Thanks everyone for your help!