Have a Neey 4A active balancer waiting to be added to my 16S LiFePo4 OffGrid system that needs more than a passive balancer. My understanding is the original Neey units did not have the ability to switch off below a set cell voltage. The generation 3 now has this feature ( as of ? 6 months ago) that can be adjusted via the Bluetooth app. I am currently using the standalone Jikong 2A active balancer with balancing to come on when delta V is > than 20mV as it too has no setting to switch off below a set voltage ( unlike the combined Jikong BMS/ active balancer). When I mentioned to Andy from OffGrid Garage channel, that the gen 3 Neey was perhaps the go to add-on active balancer, he stated that the switch on/off mechanism was not ideal and could lead to a problem. I think this may have been covered in one of his videos, but I haven't clarified this issue yet. Certainly top balancing with an active balancer seems to be the preferred method, but there is a paucity of add on active balancers capable of this