I have three brand new 6S Surface Mount parts Low Voltage Cutoff boards made by Geoff57 that are available for sale. These boards are each set up to parallel up to 4P of Lipo batteries balance connectors (7 pin JST-XH). They have a fifth connector and cable for balance charging via a balancing charger such as an RC charger. The low voltage circuits feed an optically isolated bus that can be used to pull down the throttle or trip the ebrake input on the controller. Since they don't interfere with the current path there is no current limit or loss in the battery to controller wiring. Because they use surface mount parts they are very small.
This set of three boards is suitable for up to 18S and up to 4P (with suitable cabling they could go beyond 4P). These are the Goodrum/Fechter design but since implemented in surface mount they are much smaller than the through hole boards. They came pre-assembled from Geoff57. They have not been installed or used.
Set of three boards and cables $90 plus shipping. (This is below my cost).
3 each LVC pc boards, with LVC in/out cabling to daisy chain them. Each with 4 jacks for JST-XH balance leads from Lipo batteries, plus fifth jack for balancing.
1 each LVC cable to connect to throttle or ebrake
3 each 6S JST-XH double female balancing cables. These attach to the JST-XH on the end of the board and provide a connection to your balance charger or balancer. They reverse the pinout which is needed for this edge connector. Plugs into celllog, balancer or RC charger.
3 each sticky foam pads to protect bottom of circuit boards