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Recommended Procedure to attach "DALY SMART BMS" to "4S" batteries.

There are several different models of Daly Smart BMS. This is with reference to a 4S BMS board with black heatsinks and no fan.
  1. Before adding Bus Bars, verify that Voltage on each cell is identical.
  2. Add Bus Bars, and wire the individual balance wires from the unconnected balance wire header to the battery lugs (being sure of the order of connections). DO NOT have the balancing plug connected into the BMS while connecting these wires.
  3. Connect the Temp Sensor Lead.
  4. Connect the "B-" wire to the batty pack grounding lug ("-" terminal on the first cell).
Only now plug the header for the five BMS leads into the Daly BMS.

In larger Daly BMS units ("8S" and etc.) you can now check for zero resistance between "B-" and "P-", but with most 4S models it will be infinity - the BMS is not yet active. It can be activated in one of 3 ways.

  1. plug the UART-USB cable into a computer; or
  2. plug in a UART "SOC" monitor; or
  3. Start charging between your "P-" lead and the (fused) "12v" lug of your battery pack.
My thanks to member HighTechLab for providing corrections to a previous and erroneous earlier version.

I also re-edited this on 9/14/21, to also add the activation by plugging in a Daly UART State-of-Charge LCD monitor. That is now my favorite method, because a battery which is already at a high State of Charge will generally NOT be activated by applying a charge source, if your battery pack is already at a high State of Charge while attempting to activate the BMS.
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Deleted the old 3 star review because post was updated.

The only thing to make sure of when activating these BMS units is that the NTC (Temperature probe) connector is plugged in. The BMS will not turn on if the temp probe is excluded from the installation.
Hopefully this helps others as this is what i found while having issues getting mine to work and worked out this method