Efest just rewraps cells usually lower b or c bin cells. And charges more to put a metallic purple wrap on it. It’s cheaper to buy the parent cell underneath. They buy the cheapest batteries possible and wrap them. Most cells you buy name brand are b grade cells. B1, b2 or b3. Your A grades go to oem for tool packs, vacuums, medical devices, laptops etc. If you remove cells from tool packs those are a grade cells.
Keep power and orbtronic usually tell you the parent cell underneath. Unless you need a button top just buy the name brand cell it’s cheaper. Also with efest you never know what your getting it’s whatever they get. There 2500 mah cell could be a 25r, he2,he4 etc even the same batch can be different cells. Imren does the same thing. Efest imren, keep power, orbtronic do not manufacturer cells they just put their wrapper on it and charge double the price. Which seems to work great for them. If I had the money I’d start my own cell company up. Lots of money to be made rewrapping lower grade cells
Sometimes companies like Basen will show you the b grade rating of the cell they use it’s on the pallets they receive them on. Rewrappers care about profit. Oem care about quality and warranty. Rewrappers couldn’t afford to pay for a1, a2 grade cells and keep their profit margin. Oems purchase millions of cells not just 10 20 thousand like rewrappers