I was unsure about these PCBs since there are so many imitations on Aliexpress, but these seem to be the real deal! cheaper than I could buy as a kit, then have to solder myself, plus it looks very well put together. the plastic cell holders are actually better quality in person than the brittle looking plastic image shows too. in person, they're thicker, and curve around the cells instead of 90° angles. I'll definitely be ordering more from here as my project requires more power.