IME
the Shorai Battery works well. Fitted mine about a year ago. As I've said in another thread, I recently got my bike out of hibernation. It had spent 5 months in the back of a van with low DAYTIME temps of -16c . At first it turned over rather slow, gave it a minutes rest and it turned over faster and fired up.
Pretty good IMO but pretty pricey at £150 ish