I don't know what went wrong in your particular case and really sorry to hear you had issues...
In case of warranty repair, we always do it free of charge, however I also need to point out that fail rates are very low on this BMS. It's a fairly complicated product and most returns are due to customer's mistake, like wrong connection, not following the manual... We all want stuff to be user-friendly and self-explanatory, however in this case a good study of the manual (76 pages!) is highly recommended. The most common mistake is connecting balance leads incorrectly or before BMS is powered. While BMS is designed to withstand a lot of abuse, in some cases this can lead to a fried frontend chip.
I understand shipping costs are high, and some time ago we were offering cheap airmail via post office, however there were all kinds of issues and it was just too slow. Now very few customers ask for cheaper method of delivery and we simply no longer offer it.
As for QC, you may find over 50 test points on the PCB... We have automated test jigs with spring-loaded needles and use these as one of checks during QC before shipping. Over 35 scripted checks are done automatically, including flashing of latest firmware. We also have a sophisticated ERP system for process control, so I can say confidently that none of units are shipped defective... I am really proud of this actually, as these jigs were a comparable project to BMS itself, complexity and investment-wise. When you think about it, it's not very easy to emulate various working parameters and checking every component on the board, for example if correct value capacitor is soldered in and if there are any micro-fractures in the resistors, etc. All of this is being tested automatically in our product.
All in all, this BMS requires some training and is meant to be used in OEM environment.. We have some very big names on our customer list (most of them behind NDA) and DIYers are a minority (and most costly to support per unit sold).
BTW, the Hacksmith have recently built a lightsaber with our BMS and battery modules:
smart and Tiny BMS solution
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