I have been burned by WattCycle twice now. With the most recent failure, they sold me a BT version of the 48V 100 Ah golf battery. When I received it, it was clear that there was NO BT module. I was later told that I had received an "early" batch that failed to include the module. I was offered a battery shunt in compensation. While I accepted the shunt because I needed the battery already, I remain angry about this bait and switch, and in retrospect think that I should've simply returned it to get what I was promised, or buy one of their other brands.
In the other failure, I ordered two 12V BT batteries. I was sent the non-BT versions not once, but twice. This was inconvenient and showed poor shipping management.
I do like the brand, and I wish they would do more to not mislead their buyers. I was disappointed with these two experiences.