I agree Chinese cells are not good quality. I find in my experience the LG are mediocre in terms of power and longevity. The best cells IMO is the Panasonic. There's a good reason why Tesla use them. I bought a 52v 20Ah battery from Electro Bike World with genuine Panasonic cells and they perform brilliantly! I've had it for well over 3 years now and it still charges fully to 58.8v every time. It still has the power as the day I first bought it. It's absolutely amazing and I wouldn't use any other battery moving forward.