[BrianG]

That balancer looks like it is very similar to the Hyperion LBA balancers, so it probably operates the same way. Try pushing the large button right below the single red LED once you hook up the pack. Also, there might be a time limit on how long you are taking to hook it up. On the LBA's, you have 10 or 12 seconds between hooking the main leads to the battery and hooking up the balancer leads.

Assuming it IS like the LBA balancers: Initially, the balancer is in "stand-alone" mode and the balancer inputs are isolated from the battery outputs (to prevent shorts). Once you hook it to the charger, pressing the button puts it in "online mode" and makes the electrical connection between the balancer input and output.