I'm owner of two SAP E-Max Scooters that both have guineng silicone batteries with partial failures after 3k and the other after 5k kilometers. It seems they work quite well, also at low temps. (better than lead acid for sure)
I don't trust the chargers from SAP to much, maybe they are half the reason for the failures.
The poor quality you can buy nowadays is probably a result of patent issues lost by guineng which was the original supplier of SAP.
I haven't tested the greensaver batts, because I rebuild one scooter with duct-tape batts for 2300 kilometers so far. A defect in the controller stopped this experiment for a while now, but I already had one broken connector on the duct tape cells.
-Olaf