There’s not much info on it, but has anyone seen this BMS? Flexi is out of stock and there are not that many alternatives in the same price range. Based on LTC6813.
https://www.aliexpress.com/item/1005003573073309.html?spm=a2g0o.productlist.0.0.59eb23d1AgyEes&algo_pvid=0e4e16e5-32e7-44c3-82d7-3e3df25606c7&algo_exp_id=0e4e16e5-32e7-44c3-82d7-3e3df25606c7-5&pdp_ext_f={“sku_id”%3A"12000026335292713"}